1) The document discusses file handling in C++ using fstream. Files allow storing data permanently unlike cin and cout streams.
2) Files can be opened using constructor functions or member functions like open(). open() allows specifying the file mode like read/write.
3) Reading and writing to files can be done using extraction/insertion operators, get()/put(), or read()/write() functions depending on data types. Member functions help check file status and position.
The document discusses file input and output streams in C++. It introduces the different stream classes - ifstream, ofstream and fstream that are used for file operations. It explains how to open and close files using constructor and open() member function. It describes sequential input/output operations using functions like put(), get(), write() and read(). It also covers concepts like file pointers, seek functions and detecting end of file. The document is a chapter from a book that provides an overview of file I/O in C++.
This document discusses files and streams in C++. It explains that the fstream library allows reading from and writing to files using ifstream, ofstream, and fstream objects. It covers opening, closing, writing to, and reading from files, noting that files must be opened before use and should be closed after. The standard openmode arguments and open(), close(), write, and read syntax are provided. Examples of reading from and writing to files are included.
This document discusses file handling in C/C++. It begins by defining a computer file and explaining why file handling is important in programming. It then outlines the five main steps for file handling in C++, which are to include header files, declare file stream variables, associate streams with files, perform read/write operations, and close files. Various C++ file stream functions like open(), close(), getline(), and >> and << operators are described. Code snippets are provided as examples to read from and write to text files, appending data to files, and getting all data from a file.
The document discusses files and streams in C++. It defines files as sequences of bytes that end with an end-of-file marker. Streams are used to connect programs to files for input and output. There are standard input and output streams (cin and cout) as well as file streams that use classes like ifstream for input and ofstream for output. Files can be accessed sequentially or randomly - sequential files are read from start to finish while random access files allow direct access to any record.
The document discusses file input and output streams in C++. It covers key topics like:
- Opening files using constructors and the open() function
- Using input and output streams like ifstream and ofstream to read from and write to files
- Controlling file pointers using functions like seekg(), seekp(), tellg(), and tellp()
- Performing sequential and random access file I/O using functions like put(), get(), read(), and write()
- Handling errors during file operations using functions in the ios class like fail(), eof(), bad(), and good()
This document provides an overview of data structures and algorithms. It discusses pseudo code, abstract data types, atomic and composite data, data structures, algorithm efficiency using Big O notation, and various searching algorithms like sequential, binary, and hashed list searches. Key concepts covered include pseudo code structure and syntax, defining algorithms with headers and conditions, and analyzing different search algorithms.
This document discusses file handling in C++. It begins by explaining that files allow data to be stored permanently on secondary storage devices like hard disks, unlike variables in memory. It then covers key topics like:
- The different types of files, such as text files containing readable characters and binary files containing raw data.
- Classes used for file input/output like ifstream, ofstream, and fstream.
- Opening, closing, reading from, and writing to files using functions like open(), close(), get(), put(), seekg(), tellg(), seekp(), and tellp().
- File pointers that track read/write positions and functions to manipulate them.
- Examples of creating
1) The document discusses file handling in C++ using fstream. Files allow storing data permanently unlike cin and cout streams.
2) Files can be opened using constructor functions or member functions like open(). open() allows specifying the file mode like read/write.
3) Reading and writing to files can be done using extraction/insertion operators, get()/put(), or read()/write() functions depending on data types. Member functions help check file status and position.
The document discusses file input and output streams in C++. It introduces the different stream classes - ifstream, ofstream and fstream that are used for file operations. It explains how to open and close files using constructor and open() member function. It describes sequential input/output operations using functions like put(), get(), write() and read(). It also covers concepts like file pointers, seek functions and detecting end of file. The document is a chapter from a book that provides an overview of file I/O in C++.
This document discusses files and streams in C++. It explains that the fstream library allows reading from and writing to files using ifstream, ofstream, and fstream objects. It covers opening, closing, writing to, and reading from files, noting that files must be opened before use and should be closed after. The standard openmode arguments and open(), close(), write, and read syntax are provided. Examples of reading from and writing to files are included.
This document discusses file handling in C/C++. It begins by defining a computer file and explaining why file handling is important in programming. It then outlines the five main steps for file handling in C++, which are to include header files, declare file stream variables, associate streams with files, perform read/write operations, and close files. Various C++ file stream functions like open(), close(), getline(), and >> and << operators are described. Code snippets are provided as examples to read from and write to text files, appending data to files, and getting all data from a file.
The document discusses files and streams in C++. It defines files as sequences of bytes that end with an end-of-file marker. Streams are used to connect programs to files for input and output. There are standard input and output streams (cin and cout) as well as file streams that use classes like ifstream for input and ofstream for output. Files can be accessed sequentially or randomly - sequential files are read from start to finish while random access files allow direct access to any record.
The document discusses file input and output streams in C++. It covers key topics like:
- Opening files using constructors and the open() function
- Using input and output streams like ifstream and ofstream to read from and write to files
- Controlling file pointers using functions like seekg(), seekp(), tellg(), and tellp()
- Performing sequential and random access file I/O using functions like put(), get(), read(), and write()
- Handling errors during file operations using functions in the ios class like fail(), eof(), bad(), and good()
This document provides an overview of data structures and algorithms. It discusses pseudo code, abstract data types, atomic and composite data, data structures, algorithm efficiency using Big O notation, and various searching algorithms like sequential, binary, and hashed list searches. Key concepts covered include pseudo code structure and syntax, defining algorithms with headers and conditions, and analyzing different search algorithms.
This document discusses file handling in C++. It begins by explaining that files allow data to be stored permanently on secondary storage devices like hard disks, unlike variables in memory. It then covers key topics like:
- The different types of files, such as text files containing readable characters and binary files containing raw data.
- Classes used for file input/output like ifstream, ofstream, and fstream.
- Opening, closing, reading from, and writing to files using functions like open(), close(), get(), put(), seekg(), tellg(), seekp(), and tellp().
- File pointers that track read/write positions and functions to manipulate them.
- Examples of creating
The document discusses file input and output in C++ programs. It explains that programs can store data permanently by writing it to files on secondary storage using output file streams. It also describes how programs can read in data from files using input file streams. Key classes for file input/output in C++ are ifstream for reading, ofstream for writing, and fstream for both reading and writing. The open() method is used to connect stream objects to physical files.
This is an intermediate conversion course for C++, suitable for second year computing students who may have learned Java or another language in first year.
The document discusses reading and writing files in Python. It explains that files allow data to be persisted beyond a program's execution and are used to store data on storage devices like hard disks. The main steps for reading and writing files are to open the file, use it (read from or write to it), and close the file. It also provides examples of opening file streams in read and write modes, and using methods like read(), readline(), and write() to interact with files.
Streams are used to represent different kinds of data flow in C++. There are input streams like ifstream that allow reading from files and output streams like ofstream that allow writing to files. Each file stream has get and put pointers that indicate the current position for reading and writing. Functions like seekg(), tellg(), seekp(), and tellp() can be used to set and retrieve the position of these pointers to allow reading from or writing to arbitrary locations in a file.
1. The document discusses file handling in C++, including opening and closing files, stream state member functions, and different types of file operations.
2. Key classes for file input/output in C++ include ifstream for reading files, ofstream for writing files, and fstream for reading and writing. These classes inherit from iostream and allow file access using insertion and extraction operators.
3. The document covers opening and closing files, checking for errors, reading and writing basic data types to files, binary file operations using read() and write(), and random access in files using seekp(), seekg(), and tellp(). It provides examples of reading from and writing to both text and binary files.
Files are used to store data permanently. C++ provides the fstream, ifstream, and ofstream classes to handle file input/output. These classes allow you to open, read, write, and close files. The key file operations in C++ are open() to create or open a file, read() and write() to input and output data, and close() to finalize changes and release resources. A program example is given that takes user input, stores it in a text file, then reads and displays the data.
The document discusses file handling in Java. It covers:
1) The System class contains standard input, output, and error streams for file I/O.
2) Files allow storing data permanently even after a program terminates. Java uses file streams for input and output between memory and disk files.
3) Files can be text or binary. Text files can be read by editors while binary files contain internal data representations. Objects can also be written to files.
This document discusses C++ streams and stream classes. It explains that streams represent the flow of data in C++ programs and are controlled using classes. The key classes are istream for input, ostream for output, and fstream for file input/output. It provides examples of reading from and writing to files using fstream, and describes various stream manipulators like endl. The document also discusses the filebuf and streambuf base classes that perform low-level input/output operations.
This document discusses reading from and writing to files in Java programs. It explains how to open a file using a Scanner or PrintWriter object, read/write data using methods like next() and println(), and close the file when finished. It recommends storing file data in memory structures, processing it, then writing the results back to improve efficiency over sequential file access. Proper file handling and exception handling are also emphasized.
This document provides an outline and overview of input/output (I/O) streams in Java. It discusses the different types of streams including byte streams, character streams, buffered streams, and data streams. It explains the InputStream and OutputStream abstract classes and how to read from and write to streams using methods like read(), write(), flush(), and close(). Examples are provided for reading from files, the keyboard, and writing to the console using different stream types.
This document discusses file input and output (I/O) in C++. It explains that a file contains a collection of related data stored on disk and is accessed using input and output pointers. It describes functions for manipulating these pointers like seekg(), seekp(), tellg(), and tellp(). It also covers reading and writing single characters and blocks of data using functions like put(), get(), write(), and read(). Finally, it discusses using command line arguments to specify file names and handling errors in file I/O.
The document discusses Ruby's input and output capabilities. It covers:
- Ruby provides two interfaces for I/O - simple print/gets methods and more advanced methods in the Kernel module.
- All I/O is handled by the IO base class, which File and BasicSocket subclass. IO objects represent bidirectional channels between Ruby and external resources.
- Files can be opened for reading, writing or both using File.new/File.open, specifying a mode. File streams support various methods for reading and writing lines and bytes.
- Random access methods like pos, tell, seek allow reading/writing specific locations in files and strings.
LZW is a lossless data compression algorithm that replaces repeated strings of characters with codes. It works by starting with a dictionary of single characters and building the dictionary as more data is encoded. Strings are replaced with codes which are output, and new strings are added to the dictionary. For decompression, the same dictionary is rebuilt from the codes to reconstruct the original data losslessly. LZW is particularly effective for text compression and was used widely in GIF images due to its good compression ratio and efficiency.
Outlines of this lecture:
- What is stream?
- File Output Stream Class
- File Input Stream Class
- Byte Array Output Stream Class
- Sequence Input Stream Class
- File Reader Class
- File Writer Class
- Scanner with String
This document provides an overview of input and output (I/O) in Java, including reading and writing local files. It discusses Java streams for reading input and writing output, and the classes for character-based and byte-based streams. The document outlines connecting to files, reading and writing characters and objects to files, and file management tasks like creating directories and deleting files.
This document discusses Java file input/output and streams. It covers the core stream classes like InputStream, OutputStream, Reader and Writer and their subclasses. File and FileInputStream/FileOutputStream allow working with files and directories on the file system. The key abstraction is streams, which are linked to physical devices and provide a way to send and receive data through classes that perform input or output of bytes or characters.
The document discusses file handling operations in Visual Basic. It defines a file as a collection of stored data and describes three types of files: sequential access, random access, and binary. It then explains various file handling operations like opening, closing, writing, reading and detecting the end of a file. It provides syntax for performing these operations and describes how to apply these concepts in a sample application for creating, appending to, reading from and writing to a file.
Parquet is an open source columnar storage format for Hadoop data. It was developed as a collaboration between Twitter and Cloudera to optimize IO and storage for analytics workloads on large datasets. Parquet supports efficient compression and encoding techniques that reduce storage size and enable faster scans by only loading the columns needed. It can be used with existing Hadoop tools and was implemented in Java, C++, and other languages to integrate with frameworks like Hive and Impala. Initial results at Twitter showed a 28% reduction in storage size and up to a 50% improvement in scan speeds compared to the previous Thrift format.
This document discusses Python file handling and operations. It covers opening, reading, writing, closing, and modifying files. Some key points include:
- The open() function is used to open a file and returns a stream object. This object has methods like read(), write(), seek() to interact with the file.
- Files can be opened in read, write, append, and binary modes. The default is read mode.
- To read a file, the stream object's read() method is used. seek() allows changing the read position.
- Writing requires opening in write or append mode and using write() on the stream.
- It is important to close files to free resources using the close() method
This chapter discusses input/output (I/O) streams and data files in C++. It covers file stream objects and methods for reading from and writing to text files. Methods like open(), close(), fail() and good() are used to work with files. The chapter also discusses random file access using functions like seekg(), tellg() and file streams as arguments to functions. Common programming errors with files are outlined. Finally, it provides a summary of the key points around I/O streams, file access and manipulation using the iostream class library in C++.
Linux System Programming - Buffered I/O YourHelper1
This document discusses buffered I/O in 3 parts:
1) Introduction to buffered I/O which improves I/O throughput by using buffers to handle speed mismatches between devices and applications. Buffers temporarily store data to reduce high I/O latencies.
2) User-buffered I/O where applications use buffers in user memory to minimize system calls and improve performance. Block sizes are important to align I/O operations.
3) Standard I/O functions like fopen(), fgets(), fputc() which provide platform-independent buffered I/O using file pointers and buffers. Functions allow reading, writing, seeking and flushing data to streams.
The document discusses input and output streams in Java. It provides an overview of character streams, byte streams, and connected streams. It explains how to read from and write to files using FileInputStream, FileOutputStream, FileReader, and FileWriter. It emphasizes the importance of specifying the correct character encoding when working with text files. An example demonstrates reading an image file as bytes, modifying some bytes, and writing the image to a new file.
The document discusses file input and output in C++ programs. It explains that programs can store data permanently by writing it to files on secondary storage using output file streams. It also describes how programs can read in data from files using input file streams. Key classes for file input/output in C++ are ifstream for reading, ofstream for writing, and fstream for both reading and writing. The open() method is used to connect stream objects to physical files.
This is an intermediate conversion course for C++, suitable for second year computing students who may have learned Java or another language in first year.
The document discusses reading and writing files in Python. It explains that files allow data to be persisted beyond a program's execution and are used to store data on storage devices like hard disks. The main steps for reading and writing files are to open the file, use it (read from or write to it), and close the file. It also provides examples of opening file streams in read and write modes, and using methods like read(), readline(), and write() to interact with files.
Streams are used to represent different kinds of data flow in C++. There are input streams like ifstream that allow reading from files and output streams like ofstream that allow writing to files. Each file stream has get and put pointers that indicate the current position for reading and writing. Functions like seekg(), tellg(), seekp(), and tellp() can be used to set and retrieve the position of these pointers to allow reading from or writing to arbitrary locations in a file.
1. The document discusses file handling in C++, including opening and closing files, stream state member functions, and different types of file operations.
2. Key classes for file input/output in C++ include ifstream for reading files, ofstream for writing files, and fstream for reading and writing. These classes inherit from iostream and allow file access using insertion and extraction operators.
3. The document covers opening and closing files, checking for errors, reading and writing basic data types to files, binary file operations using read() and write(), and random access in files using seekp(), seekg(), and tellp(). It provides examples of reading from and writing to both text and binary files.
Files are used to store data permanently. C++ provides the fstream, ifstream, and ofstream classes to handle file input/output. These classes allow you to open, read, write, and close files. The key file operations in C++ are open() to create or open a file, read() and write() to input and output data, and close() to finalize changes and release resources. A program example is given that takes user input, stores it in a text file, then reads and displays the data.
The document discusses file handling in Java. It covers:
1) The System class contains standard input, output, and error streams for file I/O.
2) Files allow storing data permanently even after a program terminates. Java uses file streams for input and output between memory and disk files.
3) Files can be text or binary. Text files can be read by editors while binary files contain internal data representations. Objects can also be written to files.
This document discusses C++ streams and stream classes. It explains that streams represent the flow of data in C++ programs and are controlled using classes. The key classes are istream for input, ostream for output, and fstream for file input/output. It provides examples of reading from and writing to files using fstream, and describes various stream manipulators like endl. The document also discusses the filebuf and streambuf base classes that perform low-level input/output operations.
This document discusses reading from and writing to files in Java programs. It explains how to open a file using a Scanner or PrintWriter object, read/write data using methods like next() and println(), and close the file when finished. It recommends storing file data in memory structures, processing it, then writing the results back to improve efficiency over sequential file access. Proper file handling and exception handling are also emphasized.
This document provides an outline and overview of input/output (I/O) streams in Java. It discusses the different types of streams including byte streams, character streams, buffered streams, and data streams. It explains the InputStream and OutputStream abstract classes and how to read from and write to streams using methods like read(), write(), flush(), and close(). Examples are provided for reading from files, the keyboard, and writing to the console using different stream types.
This document discusses file input and output (I/O) in C++. It explains that a file contains a collection of related data stored on disk and is accessed using input and output pointers. It describes functions for manipulating these pointers like seekg(), seekp(), tellg(), and tellp(). It also covers reading and writing single characters and blocks of data using functions like put(), get(), write(), and read(). Finally, it discusses using command line arguments to specify file names and handling errors in file I/O.
The document discusses Ruby's input and output capabilities. It covers:
- Ruby provides two interfaces for I/O - simple print/gets methods and more advanced methods in the Kernel module.
- All I/O is handled by the IO base class, which File and BasicSocket subclass. IO objects represent bidirectional channels between Ruby and external resources.
- Files can be opened for reading, writing or both using File.new/File.open, specifying a mode. File streams support various methods for reading and writing lines and bytes.
- Random access methods like pos, tell, seek allow reading/writing specific locations in files and strings.
LZW is a lossless data compression algorithm that replaces repeated strings of characters with codes. It works by starting with a dictionary of single characters and building the dictionary as more data is encoded. Strings are replaced with codes which are output, and new strings are added to the dictionary. For decompression, the same dictionary is rebuilt from the codes to reconstruct the original data losslessly. LZW is particularly effective for text compression and was used widely in GIF images due to its good compression ratio and efficiency.
Outlines of this lecture:
- What is stream?
- File Output Stream Class
- File Input Stream Class
- Byte Array Output Stream Class
- Sequence Input Stream Class
- File Reader Class
- File Writer Class
- Scanner with String
This document provides an overview of input and output (I/O) in Java, including reading and writing local files. It discusses Java streams for reading input and writing output, and the classes for character-based and byte-based streams. The document outlines connecting to files, reading and writing characters and objects to files, and file management tasks like creating directories and deleting files.
This document discusses Java file input/output and streams. It covers the core stream classes like InputStream, OutputStream, Reader and Writer and their subclasses. File and FileInputStream/FileOutputStream allow working with files and directories on the file system. The key abstraction is streams, which are linked to physical devices and provide a way to send and receive data through classes that perform input or output of bytes or characters.
The document discusses file handling operations in Visual Basic. It defines a file as a collection of stored data and describes three types of files: sequential access, random access, and binary. It then explains various file handling operations like opening, closing, writing, reading and detecting the end of a file. It provides syntax for performing these operations and describes how to apply these concepts in a sample application for creating, appending to, reading from and writing to a file.
Parquet is an open source columnar storage format for Hadoop data. It was developed as a collaboration between Twitter and Cloudera to optimize IO and storage for analytics workloads on large datasets. Parquet supports efficient compression and encoding techniques that reduce storage size and enable faster scans by only loading the columns needed. It can be used with existing Hadoop tools and was implemented in Java, C++, and other languages to integrate with frameworks like Hive and Impala. Initial results at Twitter showed a 28% reduction in storage size and up to a 50% improvement in scan speeds compared to the previous Thrift format.
This document discusses Python file handling and operations. It covers opening, reading, writing, closing, and modifying files. Some key points include:
- The open() function is used to open a file and returns a stream object. This object has methods like read(), write(), seek() to interact with the file.
- Files can be opened in read, write, append, and binary modes. The default is read mode.
- To read a file, the stream object's read() method is used. seek() allows changing the read position.
- Writing requires opening in write or append mode and using write() on the stream.
- It is important to close files to free resources using the close() method
This chapter discusses input/output (I/O) streams and data files in C++. It covers file stream objects and methods for reading from and writing to text files. Methods like open(), close(), fail() and good() are used to work with files. The chapter also discusses random file access using functions like seekg(), tellg() and file streams as arguments to functions. Common programming errors with files are outlined. Finally, it provides a summary of the key points around I/O streams, file access and manipulation using the iostream class library in C++.
Linux System Programming - Buffered I/O YourHelper1
This document discusses buffered I/O in 3 parts:
1) Introduction to buffered I/O which improves I/O throughput by using buffers to handle speed mismatches between devices and applications. Buffers temporarily store data to reduce high I/O latencies.
2) User-buffered I/O where applications use buffers in user memory to minimize system calls and improve performance. Block sizes are important to align I/O operations.
3) Standard I/O functions like fopen(), fgets(), fputc() which provide platform-independent buffered I/O using file pointers and buffers. Functions allow reading, writing, seeking and flushing data to streams.
The document discusses input and output streams in Java. It provides an overview of character streams, byte streams, and connected streams. It explains how to read from and write to files using FileInputStream, FileOutputStream, FileReader, and FileWriter. It emphasizes the importance of specifying the correct character encoding when working with text files. An example demonstrates reading an image file as bytes, modifying some bytes, and writing the image to a new file.
This document provides an overview of streams and file input/output (I/O) in Java. It discusses different types of streams like input streams, output streams, byte streams, text streams, and standard streams. It also covers FileInputStream, FileOutputStream, FileReader, FileWriter, and how to use streams to read from and write to files and directories. Examples are provided demonstrating how to copy files, read from the keyboard, and use byte arrays as input streams.
This document discusses exception handling and file input/output streams in C++. It introduces try/catch blocks for exception handling and describes common exceptions like syntax errors and runtime errors. It also discusses file streams, including opening/closing files in different modes, writing to files using stream insertion operators, and reading from files using stream extraction operators. Key classes for file stream operations are ifstream, ofstream, and fstream.
This document provides an overview of streams and file input/output (I/O) in Java. It discusses the differences between text and binary files, and how to read from and write to both types of files using classes like PrintWriter, FileOutputStream, BufferedReader, and FileReader. Key points covered include opening and closing files, reading/writing text with print/println methods, and handling I/O exceptions. The goal is to learn the basic concepts and mechanisms for saving and loading data from files.
This document provides an overview of C programming basics, including:
- The structure of a C program includes header files, source code files, and libraries that are compiled and linked.
- C programming supports various data types like characters, integers, floating-point numbers, and more to store values in memory.
- Key aspects of C programming covered include input/output operations, decision making, looping, and programming examples.
The document discusses using files for input/output in C++ programs. It outlines the 5-step process: 1) include fstream header, 2) declare file stream variables, 3) associate variables with files, 4) use stream variables for input/output, 5) close files. It provides examples of opening files for input/output, reading/writing data, seeking to different positions in a file, and challenges the reader to process Dr. King's speech stored in a file.
File Handling Btech computer science and engineering pptpinuadarsh04
Data is very important. Every organization depends on its data for continuing its business operations. If the data is lost, the organization has to be closed. To store data in a computer, we need files. For example, we can store employee data like employee number, name and salary in a file in the computer and later use it whenever we want.
Similarly, we can store student data like student roll number, name and marks in the computer. In computers’ view, a file is nothing but collection of data that is available to a program. Once we store data in a computer file, we can retrieve it and use it depending on our requirements.
This is the reason computers are primarily created for handling data, especially for storing and retrieving data. In later days, programs are developed to process the data that is stored in the computer.
This document provides an overview of input/output operations in Java using the java.io package. It discusses streams and channels, file I/O, reading and writing files, serialization, and the Observer and Observable interfaces. The key classes covered include File, PrintWriter, Scanner, InputStream, OutputStream, Reader, Writer, Buffer, Channel, and classes for serialization. Examples are provided for reading and writing files using byte streams, character streams, buffers, and channels.
File operations refer to the various actions you can perform on files in a computer system. These operations typically include reading from and writing to files, as well as managing and manipulating file-related information. File operations are crucial for tasks like data storage, retrieval, and data processing in software development. Here are some common file operations:
File Creation: Creating a new file involves specifying a file name and, in some cases, a file extension. You can create files in different formats, such as text files, binary files, or specific file types like images or documents.
File Opening and Closing: To work with a file, you need to open it using the appropriate file handle. After you've finished with the file, you should close it to release system resources and ensure data integrity.
Reading from Files: Reading from a file allows you to retrieve data stored in the file. You can read files line by line or in chunks, depending on your needs. Reading can be done in text mode or binary mode, depending on the file's content.
Writing to Files: Writing to a file allows you to save data to the file. You can write text, binary data, or structured data like JSON or XML to files. You can also append data to an existing file or create a new one.
File I/O Modes: Files can be opened in various modes, such as read mode, write mode, append mode, binary mode, and more. These modes specify the intended operations you can perform on the file.
File Manipulation: File operations also include manipulating files, such as renaming, moving, copying, and deleting files. These operations are essential for file management and organization.
File Positioning: You can move the file pointer to a specific location within the file, allowing you to read or write data from a particular position.
Error Handling: Handling errors is crucial in file operations. You need to check for errors and exceptions that may occur during file operations, such as file not found, permission denied, or disk full errors.
Metadata and Attributes: You can access and modify file metadata and attributes, such as file size, timestamps (creation, modification), and file permissions.
Serialization and Deserialization: These operations involve converting complex data structures or objects into a format that can be stored in a file (serialization) and then retrieving and reconstructing the data from the file (deserialization).
File operations are available in various programming languages, and each language may provide its own set of functions and libraries for handling files. Proper file handling and error management are essential to ensure data integrity and security in software applications.
I prepared these slides for the student of FSC BSC BS Computer science.these slides are very easily understanding the concept of programming in C++.All topics are clear with the help of examples easy in reading the topic and understanding the logic.
This document discusses various web development topics including JSON, Buffers, Streams, and compressing/decompressing data with Zlib. It defines JSON as a lightweight format for storing and transporting data that is often used when data is sent from a server to a webpage. It also describes how Buffers are used to handle streams of binary data in Node.js, and the four types of streams - readable, writable, duplex, and transform. Finally, it covers why data compression is useful and provides examples of compressing and decompressing files using the Zlib module in Node.js.
The document discusses Java input/output (I/O) streams. It covers byte streams like FileInputStream and FileOutputStream for reading and writing bytes. It also covers character streams like FileReader and FileWriter for reading and writing characters. Filtered streams like BufferedInputStream are discussed which add functionality to underlying streams. The document also covers random access files and the File class.
This document provides an overview of file handling in C#, including:
- Files are collections of data stored on disk with a name and path, and become streams when opened for reading or writing. Streams represent the sequence of bytes passing through.
- The System.IO namespace contains classes for performing file operations like creating, deleting, reading and writing files. Classes include FileStream for file operations, StreamWriter for writing characters to a stream, and StreamReader for reading strings from a stream.
- Serialization converts an object to a byte stream to save to memory, file or database. Deserialization reverses this process. The SerializableAttribute is required for serialization.
Files allow programs to permanently store data. A file contains records, which are collections of related data items called fields. There are different types of files depending on how the records are ordered, such as ascending order by key field. C++ uses streams for input and output, including ifstream for input files and ofstream for output files. Objects can also be written to and read from files to create persistent objects that remember their data between runs of a program.
The document discusses various topics related to OOPS and C++ including file handling, exception handling, and file I/O. It explains how to open, write, read and close files in C++. It also describes the exception handling mechanism in C++ using try, throw, and catch keywords. Classes like ifstream, ofstream and fstream are used for file input, output, and both file input/output operations. Exceptions can be thrown and caught to handle runtime errors.
web programming UNIT VIII python by Bhavsingh MalothBhavsingh Maloth
This document provides a tutorial on Python programming. It introduces core Python concepts over several sections. The first section discusses what will be covered, including an introduction to the Python language and becoming comfortable writing basic programs. Subsequent sections cover specific Python topics like data types, operators, conditional and loop execution, functions, modules and packages for code reusability. The document emphasizes consistent indentation and readability in Python code.
This document discusses Java I/O and streams. It begins by introducing files and the File class, which provides methods for obtaining file properties and manipulating files. It then discusses reading and writing files using byte streams like FileInputStream and FileOutputStream. Character streams like PrintWriter and BufferedReader are presented for console I/O. Other stream classes covered include buffered streams, object streams for serialization, and data streams for primitive types. The key methods of various stream classes are listed.
The document provides an overview of input/output streams and serialization in C#. It discusses how streams are used for reading and writing files and describes classes like FileStream, StreamWriter, and StreamReader that provide methods for working with files. It also explains serialization and deserialization in C# - the processes of converting an object into a byte stream and back, and describes how to apply the SerializableAttribute to allow objects to be serialized.
Yihan Lian & Zhibin Hu - Smarter Peach: Add Eyes to Peach Fuzzer [rooted2017]RootedCON
Peach is a smart and widely used fuzzer, which has lots of advantages like cross-platform, aware of file format, extend easily and so on. But when AFL fuzzer has appeared, peach seems to be out of date, since it doesn't have coverage feedback and run slowly. Due to peach is a flexible fuzzer framework and AFL is not, I extended peach with AFL advantages, making it more smarter.Just like AFL, I use LLVM Pass to add coverage feedback, with that I can see which mutation is interesting viz. explores new paths. The resultant effect is that the modified version is more effective.
Meeple centred design - Board Game AccessibilityMichael Heron
Delivered at the UK Games Expo on Friday 1st of June, 2018 . In this seminar, Dr Michael Heron and Pauline Belford of Meeple Like Us discuss the topic of board game accessibility and why support for people with disabilities within the tabletop gaming community is important - not just for its own sake, but for all of us.
Pages referenced here:
Meeple Like Us: http://meeplelikeus.co.uk
The Game Accessibility Guidelines: http://gameaccessibilityguidelines.com/
Eighteen Months of Meeple Like Us:
http://meeplelikeus.co.uk/eighteen-months-of-meeple-like-us-an-exploration-into-the-state-of-board-game-accessibility/
Meeple Centred Design: http://meeplelikeus.co.uk/meeple-centred-design-a-heuristic-toolkit-for-evaluating-the-accessibility-of-tabletop-games/
This document discusses the challenges of defining and identifying plagiarism in programming coursework submissions. It notes that software engineering best practices like code reuse and standard algorithms/patterns can conflict with academic definitions of plagiarism. It also examines ethics issues around methods for identifying plagiarism in code, and recommends as good practice notifying students of potential mini-vivas in advance and giving them access to annotated transcripts before misconduct hearings. The overall aim is to have a fair and balanced approach that considers the complexities of programming assignments and students' perspectives.
Accessibility Support with the ACCESS FrameworkMichael Heron
The ACCESS Framework aims to improve accessibility support by making it more accessible itself. It uses plug-ins to identify usability issues and automatically make corrections to address them. Users provide feedback to reinforce helpful changes. Evaluation found the framework improved performance on mouse tasks and users understood and accepted its approach after using it. Future work focuses on additional input methods, cross-platform support, and community involvement.
ACCESS: A Technical Framework for Adaptive Accessibility SupportMichael Heron
The document describes ACCESS, an open source framework that aims to provide accessibility support for older and less experienced computer users by automatically configuring the operating system based on a user's interactions. The framework uses plugins that monitor user behavior and can make changes like increasing mouse click thresholds. Experimental results found users found the tool beneficial and non-intrusive. Future work includes adding real-time correction and addressing security/trust issues before broader deployment.
This document discusses authorship and collaboration in multiplayer online text-based games (MUDs). It notes that MUDs have no single author and evolve continuously through contributions from many developers and players over long periods of time. Determining authorial intent is difficult as control and direction change hands frequently. The code infrastructure is built and maintained by many, influencing but not dictating the narrative elements added by others. Players also influence the game's direction through feedback and invested time. Thus MUDs frustrate traditional notions of a fixed work with a single author.
This document discusses object inheritance in systems analysis and design. It covers key concepts like inheritance, composition, aggregation, and the relationships between classes. It explains how inheritance allows classes to inherit attributes and behaviors from parent classes, and how child classes can specialize or extend parent classes through overriding and adding new functionality. The document also discusses the differences between single and multiple inheritance and how inheritance is implemented in languages like Java and .NET.
Rendering involves several steps: identifying visible surfaces, projecting surfaces onto the viewing plane, shading surfaces appropriately, and rasterizing. Rendering can be real-time, as in games, or non-real-time, as in movies. Real-time rendering requires tradeoffs between photorealism and speed, while non-real-time rendering can spend more time per frame. Lighting is an important part of rendering, as the interaction of light with surfaces through illumination, reflection, shading, and shadows affects realism.
This is an intermediate conversion course for C++, suitable for second year computing students who may have learned Java or another language in first year.
This is an intermediate conversion course for C++, suitable for second year computing students who may have learned Java or another language in first year.
This is an intermediate conversion course for C++, suitable for second year computing students who may have learned Java or another language in first year.
This is an intermediate conversion course for C++, suitable for second year computing students who may have learned Java or another language in first year.
WMF 2024 - Unlocking the Future of Data Powering Next-Gen AI with Vector Data...Luigi Fugaro
Vector databases are transforming how we handle data, allowing us to search through text, images, and audio by converting them into vectors. Today, we'll dive into the basics of this exciting technology and discuss its potential to revolutionize our next-generation AI applications. We'll examine typical uses for these databases and the essential tools
developers need. Plus, we'll zoom in on the advanced capabilities of vector search and semantic caching in Java, showcasing these through a live demo with Redis libraries. Get ready to see how these powerful tools can change the game!
Odoo releases a new update every year. The latest version, Odoo 17, came out in October 2023. It brought many improvements to the user interface and user experience, along with new features in modules like accounting, marketing, manufacturing, websites, and more.
The Odoo 17 update has been a hot topic among startups, mid-sized businesses, large enterprises, and Odoo developers aiming to grow their businesses. Since it is now already the first quarter of 2024, you must have a clear idea of what Odoo 17 entails and what it can offer your business if you are still not aware of it.
This blog covers the features and functionalities. Explore the entire blog and get in touch with expert Odoo ERP consultants to leverage Odoo 17 and its features for your business too.
An Overview of Odoo ERP
Odoo ERP was first released as OpenERP software in February 2005. It is a suite of business applications used for ERP, CRM, eCommerce, websites, and project management. Ten years ago, the Odoo Enterprise edition was launched to help fund the Odoo Community version.
When you compare Odoo Community and Enterprise, the Enterprise edition offers exclusive features like mobile app access, Odoo Studio customisation, Odoo hosting, and unlimited functional support.
Today, Odoo is a well-known name used by companies of all sizes across various industries, including manufacturing, retail, accounting, marketing, healthcare, IT consulting, and R&D.
The latest version, Odoo 17, has been available since October 2023. Key highlights of this update include:
Enhanced user experience with improvements to the command bar, faster backend page loading, and multiple dashboard views.
Instant report generation, credit limit alerts for sales and invoices, separate OCR settings for invoice creation, and an auto-complete feature for forms in the accounting module.
Improved image handling and global attribute changes for mailing lists in email marketing.
A default auto-signature option and a refuse-to-sign option in HR modules.
Options to divide and merge manufacturing orders, track the status of manufacturing orders, and more in the MRP module.
Dark mode in Odoo 17.
Now that the Odoo 17 announcement is official, let’s look at what’s new in Odoo 17!
What is Odoo ERP 17?
Odoo 17 is the latest version of one of the world’s leading open-source enterprise ERPs. This version has come up with significant improvements explained here in this blog. Also, this new version aims to introduce features that enhance time-saving, efficiency, and productivity for users across various organisations.
Odoo 17, released at the Odoo Experience 2023, brought notable improvements to the user interface and added new functionalities with enhancements in performance, accessibility, data analysis, and management, further expanding its reach in the market.
Alluxio Webinar | 10x Faster Trino Queries on Your Data PlatformAlluxio, Inc.
Alluxio Webinar
June. 18, 2024
For more Alluxio Events: https://www.alluxio.io/events/
Speaker:
- Jianjian Xie (Staff Software Engineer, Alluxio)
As Trino users increasingly rely on cloud object storage for retrieving data, speed and cloud cost have become major challenges. The separation of compute and storage creates latency challenges when querying datasets; scanning data between storage and compute tiers becomes I/O bound. On the other hand, cloud API costs related to GET/LIST operations and cross-region data transfer add up quickly.
The newly introduced Trino file system cache by Alluxio aims to overcome the above challenges. In this session, Jianjian will dive into Trino data caching strategies, the latest test results, and discuss the multi-level caching architecture. This architecture makes Trino 10x faster for data lakes of any scale, from GB to EB.
What you will learn:
- Challenges relating to the speed and costs of running Trino in the cloud
- The new Trino file system cache feature overview, including the latest development status and test results
- A multi-level cache framework for maximized speed, including Trino file system cache and Alluxio distributed cache
- Real-world cases, including a large online payment firm and a top ridesharing company
- The future roadmap of Trino file system cache and Trino-Alluxio integration
Mobile App Development Company In Noida | Drona InfotechDrona Infotech
React.js, a JavaScript library developed by Facebook, has gained immense popularity for building user interfaces, especially for single-page applications. Over the years, React has evolved and expanded its capabilities, becoming a preferred choice for mobile app development. This article will explore why React.js is an excellent choice for the Best Mobile App development company in Noida.
Visit Us For Information: https://www.linkedin.com/pulse/what-makes-reactjs-stand-out-mobile-app-development-rajesh-rai-pihvf/
Why Apache Kafka Clusters Are Like Galaxies (And Other Cosmic Kafka Quandarie...Paul Brebner
Closing talk for the Performance Engineering track at Community Over Code EU (Bratislava, Slovakia, June 5 2024) https://eu.communityovercode.org/sessions/2024/why-apache-kafka-clusters-are-like-galaxies-and-other-cosmic-kafka-quandaries-explored/ Instaclustr (now part of NetApp) manages 100s of Apache Kafka clusters of many different sizes, for a variety of use cases and customers. For the last 7 years I’ve been focused outwardly on exploring Kafka application development challenges, but recently I decided to look inward and see what I could discover about the performance, scalability and resource characteristics of the Kafka clusters themselves. Using a suite of Performance Engineering techniques, I will reveal some surprising discoveries about cosmic Kafka mysteries in our data centres, related to: cluster sizes and distribution (using Zipf’s Law), horizontal vs. vertical scalability, and predicting Kafka performance using metrics, modelling and regression techniques. These insights are relevant to Kafka developers and operators.
Measures in SQL (SIGMOD 2024, Santiago, Chile)Julian Hyde
SQL has attained widespread adoption, but Business Intelligence tools still use their own higher level languages based upon a multidimensional paradigm. Composable calculations are what is missing from SQL, and we propose a new kind of column, called a measure, that attaches a calculation to a table. Like regular tables, tables with measures are composable and closed when used in queries.
SQL-with-measures has the power, conciseness and reusability of multidimensional languages but retains SQL semantics. Measure invocations can be expanded in place to simple, clear SQL.
To define the evaluation semantics for measures, we introduce context-sensitive expressions (a way to evaluate multidimensional expressions that is consistent with existing SQL semantics), a concept called evaluation context, and several operations for setting and modifying the evaluation context.
A talk at SIGMOD, June 9–15, 2024, Santiago, Chile
Authors: Julian Hyde (Google) and John Fremlin (Google)
https://doi.org/10.1145/3626246.3653374
Baha Majid WCA4Z IBM Z Customer Council Boston June 2024.pdfBaha Majid
IBM watsonx Code Assistant for Z, our latest Generative AI-assisted mainframe application modernization solution. Mainframe (IBM Z) application modernization is a topic that every mainframe client is addressing to various degrees today, driven largely from digital transformation. With generative AI comes the opportunity to reimagine the mainframe application modernization experience. Infusing generative AI will enable speed and trust, help de-risk, and lower total costs associated with heavy-lifting application modernization initiatives. This document provides an overview of the IBM watsonx Code Assistant for Z which uses the power of generative AI to make it easier for developers to selectively modernize COBOL business services while maintaining mainframe qualities of service.
Unlock the Secrets to Effortless Video Creation with Invideo: Your Ultimate G...The Third Creative Media
"Navigating Invideo: A Comprehensive Guide" is an essential resource for anyone looking to master Invideo, an AI-powered video creation tool. This guide provides step-by-step instructions, helpful tips, and comparisons with other AI video creators. Whether you're a beginner or an experienced video editor, you'll find valuable insights to enhance your video projects and bring your creative ideas to life.
Consistent toolbox talks are critical for maintaining workplace safety, as they provide regular opportunities to address specific hazards and reinforce safe practices.
These brief, focused sessions ensure that safety is a continual conversation rather than a one-time event, which helps keep safety protocols fresh in employees' minds. Studies have shown that shorter, more frequent training sessions are more effective for retention and behavior change compared to longer, infrequent sessions.
Engaging workers regularly, toolbox talks promote a culture of safety, empower employees to voice concerns, and ultimately reduce the likelihood of accidents and injuries on site.
The traditional method of conducting safety talks with paper documents and lengthy meetings is not only time-consuming but also less effective. Manual tracking of attendance and compliance is prone to errors and inconsistencies, leading to gaps in safety communication and potential non-compliance with OSHA regulations. Switching to a digital solution like Safelyio offers significant advantages.
Safelyio automates the delivery and documentation of safety talks, ensuring consistency and accessibility. The microlearning approach breaks down complex safety protocols into manageable, bite-sized pieces, making it easier for employees to absorb and retain information.
This method minimizes disruptions to work schedules, eliminates the hassle of paperwork, and ensures that all safety communications are tracked and recorded accurately. Ultimately, using a digital platform like Safelyio enhances engagement, compliance, and overall safety performance on site. https://safelyio.com/
The Comprehensive Guide to Validating Audio-Visual Performances.pdfkalichargn70th171
Ensuring the optimal performance of your audio-visual (AV) equipment is crucial for delivering exceptional experiences. AV performance validation is a critical process that verifies the quality and functionality of your AV setup. Whether you're a content creator, a business conducting webinars, or a homeowner creating a home theater, validating your AV performance is essential.
Everything You Need to Know About X-Sign: The eSign Functionality of XfilesPr...XfilesPro
Wondering how X-Sign gained popularity in a quick time span? This eSign functionality of XfilesPro DocuPrime has many advancements to offer for Salesforce users. Explore them now!
The Power of Visual Regression Testing_ Why It Is Critical for Enterprise App...kalichargn70th171
Visual testing plays a vital role in ensuring that software products meet the aesthetic requirements specified by clients in functional and non-functional specifications. In today's highly competitive digital landscape, users expect a seamless and visually appealing online experience. Visual testing, also known as automated UI testing or visual regression testing, verifies the accuracy of the visual elements that users interact with.
🏎️Tech Transformation: DevOps Insights from the Experts 👩💻campbellclarkson
Connect with fellow Trailblazers, learn from industry experts Glenda Thomson (Salesforce, Principal Technical Architect) and Will Dinn (Judo Bank, Salesforce Development Lead), and discover how to harness DevOps tools with Salesforce.
The Rising Future of CPaaS in the Middle East 2024Yara Milbes
Explore "The Rising Future of CPaaS in the Middle East in 2024" with this comprehensive PPT presentation. Discover how Communication Platforms as a Service (CPaaS) is transforming communication across various sectors in the Middle East.
2. Introduction
• File I/O in C++ is a relatively straightforward affair.
• For the most part.
• Almost all I/O in C++ is handled via streams.
• Like cin and cout
• Random access files also supported.
• Not our focus.
• Concept complicated slightly by the presence of objects.
• Require a strategy to deal with object representation.
3. Stream I/O
• Stream I/O is the simplest kind of I/O
• Read in sequences of bytes from a device.
• Write out sequences of bytes to a device
• Broken into two broad categories.
• Low level I/O, whereby a set number of bytes are transferred.
• No representation of underlying data formats
• High level I/O
• Bytes are grouped into meaningful units
• Such as ints, chars or strings
4. Random Access Files
• Sequential files must be read in order.
• Random access files permit non-sequential access to data.
• System is considerably more complicated.
• Must have a firm definition of all data attributes.
• Issue complicated by the presence of ‘non-fixed length’ data
structures.
• Such as strings.
• Must work out the size of a record on disk.
5. Basic File I/O - Output
• Straightforward process
• #include <fstream>
• Instantiate an ofstream object
• Use it like cout
• Close in when done:
#include <iostream>
#include <fstream>
using namespace std;
int main() {
ofstream out("blah.txt");
out << "Hello World" << endl;
out.close
return 0;
}
6. Basic File I/O - Input
• Same deal
• Use a ifstream object
• Use it like cin
• Close when done
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
ifstream in("blah.txt");
string bleh;
in >> bleh;
cout << bleh;
in.close();
return 0;
}
7. The Process
• A file in C++ has two names.
• The name it has in the directory structure.
• Such as c:/bing.txt
• The name it has in the object you create in your C++ program.
• The link between the two is forged by the creation of a stream
object.
• This creates the connection between the two.
8. The Process
• We must close files when we are finished with them.
• Signifies to the O/S that we are done with the file.
• Flushes all remaining file accesses and commits them to the file.
• Releases the resources in our system.
• We need to do this regardless of whether it is an input or an
output operation.
9. Stream Objects
• The constructor for a stream object can take a second
parameter.
• The type of mode for the I/O
• These are defined in the namespace ios:
• ofstream out ("blah.txt", ios::app);
• Used for specialising the type of stream.
• Above sets an append.
• Others have more esoteric use.
10. So Far, So Good…
• Limited opportunities for expression with this system.
• Need more precision on representation of data
• There exist a range of stream manipulators that allow for fine-
grained control over stream I/O
• dec
• hex
• octal
• setbase
11. Stream Manipulators
• These work on simple screen/keyboard I/O and file I/O
• They make use of the Power of Polymorphism
• They are defined in the std namespace.
• Inserted into the stream where needed. Acts on the stream from
that point onwards.
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
cout << oct << 10;
return 0;
}
12. Stream Manipulators
• Some stream manipulators are parameterized
• Like setbase
• These are called parameterized stream manipulators
• They get defined in iomanip.h
• When used, they must be provided with the parameter that
specialises their behaviour.
• setbase takes one of three parameters
• 10, 8 or 16
13. Precision
• One of the common things we want to be able to do with
floating point numbers is represent their precision.
• Limit the number of decimal places
• This is done using the precision method and the fixed stream
manipulator.
• Precision takes as its parameter the number of decimal places to
use.
15. Width
• We can use the width method to set the maximum field width
of data.
• This is not a sticky modifier
• Impacts on the next insertion or extraction only.
• It does not truncate data
• You get the full number.
• It does pad data
• Useful for strings.
• Defaults to a blank space. Can use the setfill modifier to change the
padding character.
16. Other Stream Manipulators
• showpoint
• Shows all the trailing zeroes in a floating point number.
• Switched off with noshowpoint
• Justification
• Used the parameterized setw to set the width of the of the value
• Use left or right to justify
• Default is right jutsification
• Research these
• Quite a lot to handle various purposes.
17. Reading In A Paragraph
#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
int main() {
ifstream in ("blah.txt");
string str;
in >> str;
while (!in.eof()) {
cout << str << " ";
in >> str;
}
return 0;
}
18. Buffering
• The files that exist on the disk do not necessarily reflect the
information we have told C++ to write.
• Why?
• The answer is down to buffering.
• File IO is one of the most expensive procedures in executing a
program.
• C++ will try to keep the I/O costs down as far as possible through
buffering.
19. What’s In A File Access?
• File Accessing is broken down into two main stages.
• Seeking the file
• Interacting with the file.
• Imagine 500 instructions to write to a file.
• 500 seeks, 500 writes
• Buffering maintains an internal memory cache of write
accesses.
• Reduce down to 1 seek.
20. Buffering
• The file is updated under the following circumstances:
• When the file is closed.
• Thus, one of the reasons why we must close our files.
• When the buffer is full.
• Buffers are limited in size, and are ‘flushed’ when that size is
reached.
• When you explicitly instruct it.
• Done sometimes with manipulators (such as endl)
• Done using the sync method of the stream.
21. Summary
• File I/O in C++ is handled in the same way as
keyboard/monitor I/O
• At least as far as stream-based IO is concerned.
• Stream I/O is very versatile in C++
• Handled through stream manipulators
• File accesses in C++ are, as far as is possible, buffered.
• This greatly reduces the load on the hardware.