You will make changes to the class called ReadFile- Complete the proga.pdf
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You will make changes to the class called ReadFile . Complete the progam so that it prints the contents of the file specified by the user (code is provided for user input) to System.out . There are several important requirements: The main method must not be declared to throw any kind of exception. The program must not test whether or not the requested file exists before attempting to open it. The program must use a try/finally block to make sure that the reader or input stream reading the file is closed before the program exits. There is a file myFile.txt provided that contains the following contents: Here is an example session showing a file being printed successfully (user input in bold ): Here is another example session showing what happens when the user enters the name of a nonexistent file: Hints Use a try/catch block to handle an IOException or FileNotFoundException that might occur. Print the error message from the catch block. You can call the getMessage method on the caught exception object to get a string containing a textual description of the error that caused the exception..
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PAGE 1Input output for a file tutorialStreams and File IOI.docx
PAGE
1Input output for a file tutorialStreams and File I/O
In this tutorial we study the following concepts:
Text File I/O
Techniques for a file: Class File
Binary File I/O
File Objects and File Name
Note: For question 4 of the midterm you only need to look at the sections 2.2 and 2.3. I do not think you need java class: StringTokenizer. But I just added a small section about it to the end of this tutorial.
So far we learned keyboard/screen I/O. It is time to learn File I/O.
1 An Overview of stream and file I/O
A stream is an object that either outputs data or inputs data. The Java System.out is a stream object that outputs data on the screen.
As our program gets bigger and bigger we may need to enter a lot of data every time we run our program. We also may have a lot of data as the output of the program. It is not practical to enter a sizable input from the keyboard. Therefore, we save the data in a file and let our program to input from this file. Similarly, it is not practical to look at a sizable output. Moreover, we may need to save the output for further study. Therefore, we let our program to output to a file.
We have two kinds of I/O files: Text files and binary files. A text file is readable and understandable by human, but a binary file is not. The size of a text file is bigger than the size of a binary file. We can write arrays without using a loop into a binary file. We can also write objects to a binary file.
2 Text-File I/O
In this section we learn how to input from a text file and how to output to a text file. We first look at output instructions for a text file.
2.1 Text-File Output with PrintWriter class.
To be able to write to a file we need the Java class PrintWriter. This class is in JDK java.io, therefore we need to import it . Another class that we need is : FileOutputStream. This class also is in java.io. A file output stream is an output stream for writing data to a File.
Example 1. The following program to write an integer, a floating point number, a Boolean value and a string into a text file.
import java. io. PrintWriter;
import java. io. FileNotFoundException;
publicclass Main {
publicstaticvoid main( String[] args) {
PrintWriter out = null;
try {
out = new PrintWriter("out.txt");
} catch( FileNotFoundException e) {
System. out. println("Error: opening the file out.txt");
System. exit( 0);
}
out.println(-12);
out.println(25.5);
out.println(true);
out.println("John Doe.");
//Note that we also can write:
out.println(-12+"\n"+ 25.5 + "\n" + true + "\n" + "John Doe.");
out.close();
} }
The content of the file out.txt would be:
-12
25.5
true
John Doe.
-12
25.5
true
John Doe.
Description:
First we need to declare a variable that refers to and object of class PrintWriter. This class has several constructors. One of them needs the name of the output file on the hard drive (or other storages): out = new PrintWriter("out.txt")
This instruction co.
C++ - UNIT_-_V.pptx which contains details about File Concepts
The document discusses file handling in C++. It explains that files are used to store data permanently on a storage device. There are three main classes used for file handling - ifstream for input, ofstream for output, and fstream for both input and output. The key file handling operations include opening a file using open(), reading from a file using read(), writing to a file using write(), and closing a file using close(). It also discusses opening files in different modes, reading and writing binary data to files, and handling exceptions that may occur during file operations.
CS101S. ThompsonUniversity of BridgeportLab 7 Files, File.docx
CS101 S. Thompson
University of Bridgeport Lab 7: Files, File Choosers, and Scanners
Lab 4_2 Files, File Choosers, and Scanners
There are two ways to identify a file in Java.
1. The name of a file
2. Using the File object. This is a type of object that describes a file as it is stored on the computer's file system. The file system is the system of directories (folders) that the operating system uses to organize stored files so users can find them easily.
Here we just need to know that when you use a file chooser (which we will discuss next) to locate a file in the file system, the file chooser gives you access to the file selected by the user through a File object. You can see an example of a Java file chooser dialog in action below.
Here the user has used the JFileChooser dialog box to navigate to the Documents folder and select a file named infix.txt.
To use a JFileChooser, you need to know about the following constructor and methods:
JFileChooser()
int showOpenDialog(Component owner)
File getSelectedFile()
Using a JFileChooser
Look up the JFileChooser documentation online so you know what package to import. To use it, create a JFileChooser object and then call its showOpenDialog(). If you have a GUI application, pass it the Component you want it to appear on top of. This will generally be the JFrame for your application. If you are using a console application, just pass it null. Calling this method will cause a dialog box like the one below to appear:
The user will use the dialog to navigate to some folder and select a file, and then click on the Open button to accept the selected file. If the user changes his (or her) mind, he or she can click on Cancel. Either, way, the showOpenDialog will return an integer to your program indicating the user's choice. If the the user selected a file, the method will return the value JFileChooser.APPROVE_OPTION. At this point, you can call the getSelectedFile() to retrieve a File object that you can use to access the file.
Here is example code for using a file chooser object.
File file = null;
JFileChooser chooser = new JFileChooser();
int result = chooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION)
file = chooser.getSelectedFile();
else
{
JOptionPane.showMessageDialog(null, "No file selected");
System.exit(1);
}
If this code does not exit, you will have a File object named file. Next, let us look at how you can use this object to open and read a text file using a Stream object named a FileReader.
FileReader
A FileReader object is used to read text files. Text files are files that are human-readable, usually created by a text editor such as Notepad. Many applications, for example MS Word, Excel, and Access, do not create text files. Instead, they create a different type of file named a binary file. You cannot use a FileReader to read a binary file.
If you look up the documentation for the FileRea.
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PAGE 1Input output for a file tutorialStreams and File IOI.docx
PAGE
1Input output for a file tutorialStreams and File I/O
In this tutorial we study the following concepts:
Text File I/O
Techniques for a file: Class File
Binary File I/O
File Objects and File Name
Note: For question 4 of the midterm you only need to look at the sections 2.2 and 2.3. I do not think you need java class: StringTokenizer. But I just added a small section about it to the end of this tutorial.
So far we learned keyboard/screen I/O. It is time to learn File I/O.
1 An Overview of stream and file I/O
A stream is an object that either outputs data or inputs data. The Java System.out is a stream object that outputs data on the screen.
As our program gets bigger and bigger we may need to enter a lot of data every time we run our program. We also may have a lot of data as the output of the program. It is not practical to enter a sizable input from the keyboard. Therefore, we save the data in a file and let our program to input from this file. Similarly, it is not practical to look at a sizable output. Moreover, we may need to save the output for further study. Therefore, we let our program to output to a file.
We have two kinds of I/O files: Text files and binary files. A text file is readable and understandable by human, but a binary file is not. The size of a text file is bigger than the size of a binary file. We can write arrays without using a loop into a binary file. We can also write objects to a binary file.
2 Text-File I/O
In this section we learn how to input from a text file and how to output to a text file. We first look at output instructions for a text file.
2.1 Text-File Output with PrintWriter class.
To be able to write to a file we need the Java class PrintWriter. This class is in JDK java.io, therefore we need to import it . Another class that we need is : FileOutputStream. This class also is in java.io. A file output stream is an output stream for writing data to a File.
Example 1. The following program to write an integer, a floating point number, a Boolean value and a string into a text file.
import java. io. PrintWriter;
import java. io. FileNotFoundException;
publicclass Main {
publicstaticvoid main( String[] args) {
PrintWriter out = null;
try {
out = new PrintWriter("out.txt");
} catch( FileNotFoundException e) {
System. out. println("Error: opening the file out.txt");
System. exit( 0);
}
out.println(-12);
out.println(25.5);
out.println(true);
out.println("John Doe.");
//Note that we also can write:
out.println(-12+"\n"+ 25.5 + "\n" + true + "\n" + "John Doe.");
out.close();
} }
The content of the file out.txt would be:
-12
25.5
true
John Doe.
-12
25.5
true
John Doe.
Description:
First we need to declare a variable that refers to and object of class PrintWriter. This class has several constructors. One of them needs the name of the output file on the hard drive (or other storages): out = new PrintWriter("out.txt")
This instruction co.
C++ - UNIT_-_V.pptx which contains details about File Concepts
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CS101S. ThompsonUniversity of BridgeportLab 7 Files, File.docx
CS101 S. Thompson
University of Bridgeport Lab 7: Files, File Choosers, and Scanners
Lab 4_2 Files, File Choosers, and Scanners
There are two ways to identify a file in Java.
1. The name of a file
2. Using the File object. This is a type of object that describes a file as it is stored on the computer's file system. The file system is the system of directories (folders) that the operating system uses to organize stored files so users can find them easily.
Here we just need to know that when you use a file chooser (which we will discuss next) to locate a file in the file system, the file chooser gives you access to the file selected by the user through a File object. You can see an example of a Java file chooser dialog in action below.
Here the user has used the JFileChooser dialog box to navigate to the Documents folder and select a file named infix.txt.
To use a JFileChooser, you need to know about the following constructor and methods:
JFileChooser()
int showOpenDialog(Component owner)
File getSelectedFile()
Using a JFileChooser
Look up the JFileChooser documentation online so you know what package to import. To use it, create a JFileChooser object and then call its showOpenDialog(). If you have a GUI application, pass it the Component you want it to appear on top of. This will generally be the JFrame for your application. If you are using a console application, just pass it null. Calling this method will cause a dialog box like the one below to appear:
The user will use the dialog to navigate to some folder and select a file, and then click on the Open button to accept the selected file. If the user changes his (or her) mind, he or she can click on Cancel. Either, way, the showOpenDialog will return an integer to your program indicating the user's choice. If the the user selected a file, the method will return the value JFileChooser.APPROVE_OPTION. At this point, you can call the getSelectedFile() to retrieve a File object that you can use to access the file.
Here is example code for using a file chooser object.
File file = null;
JFileChooser chooser = new JFileChooser();
int result = chooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION)
file = chooser.getSelectedFile();
else
{
JOptionPane.showMessageDialog(null, "No file selected");
System.exit(1);
}
If this code does not exit, you will have a File object named file. Next, let us look at how you can use this object to open and read a text file using a Stream object named a FileReader.
FileReader
A FileReader object is used to read text files. Text files are files that are human-readable, usually created by a text editor such as Notepad. Many applications, for example MS Word, Excel, and Access, do not create text files. Instead, they create a different type of file named a binary file. You cannot use a FileReader to read a binary file.
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Exceptions in Java allow programs to handle and recover from errors and problems that occur during runtime. There are three main categories of exceptions: checked exceptions which must be declared, runtime exceptions which can be ignored, and errors which are usually outside a programmer's control. The try/catch block is used to catch exceptions, with catch blocks handling specific exception types. Finally blocks always execute regardless of exceptions. Programmers can also create their own custom exception classes.
errno is an integer variable, defined in errno.h, that is set by sys.pdf
errno is an integer variable, defined in errno.h, that is set by system calls and some library
functions in the event of an error to indicate what went wrong.
There are symbolic error names with distinct values that are defined on Linux. Each of which
corresponds to a type of error. The string description of any of these error names can be retrieved
by strerror defined in string.h.
For example, the error name “ENFILE” has the string description “Too many open files in
system”, and “ENOEXEC” has the string description “Exec format error”,and so.
In addition, perror defined in stdio.h prints the description of a system error on the standard error
device preceded by any string that you provide and colons.
Answer the following questions using a table format.
a. What are the error names and descriptions of the fork system call.
b. List all error names and descriptions specifically related to file I/O.
Solution
a)
b)
In some Unix systems, many system calls can also return EFAULT if given as an argument a
pointer into the stack, and the kernel for some obscure reason fails in its attempt to extend the
stack. If this ever happens, you should probably try using statically or dynamically allocated
memory instead of stack memory on that system.
Error Codes
The error code macros are defined in the header file `errno.h\'. All of them expand into integer
constant values. Some of these error codes can\'t occur on the GNU system, but they can occur
using the GNU library on other systems.
Macro: int EPERM
Operation not permitted; only the owner of the file (or other resource) or processes with special
privileges can perform the operation.
Macro: int ENOENT
No such file or directory. This is a \"file doesn\'t exist\" error for ordinary files that are
referenced in contexts where they are expected to already exist.
Macro: int ESRCH
No process matches the specified process ID.
Macro: int EINTR
Interrupted function call; an asynchronous signal occurred and prevented completion of the call.
When this happens, you should try the call again.
You can choose to have functions resume after a signal that is handled, rather than failing with
EINTR; see section Primitives Interrupted by Signals.
Macro: int EIO
Input/output error; usually used for physical read or write errors.
Macro: int ENXIO
No such device or address. The system tried to use the device represented by a file you specified,
and it couldn\'t find the device. This can mean that the device file was installed incorrectly, or
that the physical device is missing or not correctly attached to the computer.
Macro: int E2BIG
Argument list too long; used when the arguments passed to a new program being executed with
one of the exec functions (see section Executing a File) occupy too much memory space. This
condition never arises in the GNU system.
Macro: int ENOEXEC
Invalid executable file format. This condition is detected by the exec functions; see section
Executing a File.
Macro: int EBADF
Bad file descriptor; fo.
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Perfomatix - Java Coding Standards
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The ultimate solution is to develop small software: divide the whole stack into self-contained components that don't share files with others, each constitutes very few files (e.g. API, service, data access, test, etc.) so that it's very easy to reason about it.
asdabuydvduyawdyuadauysdasuydyudayudayudaw
The document discusses file input/output (I/O) in Java. It covers:
1) Java's I/O system of readers, writers, and streams for reading from and writing to files.
2) Exceptions in file I/O and how to handle errors using try/catch blocks.
3) Examples of reading text and binary data from files, writing data to files, and scanning files for specific data.
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It covers the following topics:
1.)Python Modules
2.)File I/O
3.)Exceptions & Error Handling
Savitch ch 06
This document summarizes Chapter 6 on I/O streams as an introduction to objects and classes in C++. It discusses streams and basic file I/O, including declaring input and output stream variables to connect to files, reading from and writing to files using extraction and insertion operators, and using member functions like open() and fail() for file operations. The key topics are objects and classes in C++ and how streams are used to perform input and output with files.
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- The cin and cout streams connect by default to keyboard input and screen output. File I/O streams like ifstream and ofstream can be used to read from and write to files.
- Member functions like open() are used to connect stream objects to files. The fail() function checks if stream operations like opening a file were successful.
- Programs should check for errors when opening files
Savitch Ch 06
This document discusses input/output (I/O) streams in C++. It covers declaring input and output stream variables to connect to files, using stream member functions like open() to connect streams to files, and extraction and insertion operators to read from and write to streams. It also describes formatting output using stream manipulators and functions like setw(), setprecision(), and flags like fixed and showpoint.
Use Java to program the following.1. Create public java class name.pdf
Use Java to program the following.
1. Create public java class named Benford.
2. It\'s main function should prompt for the name of a data file and then the function iterates
through the all of the elements in the data file and computes the frequency (count and
percentage) of the first number in each entry.
3. Note: Some of the data files have comments that you must filter out.
4. Also note: that blank lines or lines where the number begins or is 0 must also be filtered out.
5. Your output must be formatted as follows.
Solution
Hi Firend, Please find my code.
Please let me know in case of any issue.
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class CountFrequency {
public static void main(String[] args) throws FileNotFoundException {
Scanner sc = new Scanner(System.in);
// taking input file name
System.out.print(\"Enter input file name: \");
String fileName = sc.next();
// opening input file
Scanner inputFile = new Scanner(new File(fileName));
// declaring array to store count of first digit of each entery
int[] frequency = new int[10];
int totalCount = 0; // to maintain total count
int num;
// reading all lines
while(inputFile.hasNextLine()){
// reading current line
String line = inputFile.nextLine();
// if line is not empty
if(line == null || line.isEmpty() || line.trim() == \"\")
continue;
// taking first character of current line
char firstDigit = line.charAt(0);
// if first character is digit and not equal to 0
if(Character.isDigit(firstDigit) && firstDigit != \'0\'){
// converting first character of current line in integer
int d = firstDigit - \'0\';
frequency[d]++;
totalCount++;
}
}
System.out.println(\"Digit\\tCount\\tFrequency\");
for(int i=1; i<=9; i++){
System.out.println(i+\"\\t\"+frequency[i]+\"\\t\"+
((double)frequency[i]/(double)totalCount*100));
}
}
}
/*
Sample run:
##### Entry of input.txt:
453 43
//543
123
0
4ee
875
52
// Output
Enter input file name: input.txt
Digit Count Frequency
1 1 20.0
2 0 0.0
3 0 0.0
4 2 40.0
5 1 20.0
6 0 0.0
7 0 0.0
8 1 20.0
9 0 0.0
*/.
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The document summarizes a presentation on exception handling given by the group "Bug Free". It defines what exceptions are, why they occur, and the exception hierarchy. It describes checked and unchecked exceptions, and exception handling terms like try, catch, throw, and finally. It provides examples of using try-catch blocks, multiple catch statements, nested try-catch, and throwing and handling exceptions.
Exception Handling.ppt
The document discusses exception handling in Java. It covers goals of exception handling like throwing, designing, and catching exceptions. It explains the difference between checked and unchecked exceptions. It discusses separating error handling code from regular code using try/catch blocks. Exceptions allow propagating errors up the call stack. Finally, it provides examples of declaring, catching, and throwing custom exceptions.
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I need help with this Java assignment. Please include comments throu.pdf
I need help with this Java assignment. Please include comments throughout. Thanks
Write a program that will make a copy of a text file, line by line. Read the name of the existing
file and the name of the new file - the copy - from the keyboard. Use the methods of the class
File to test whether the original file exists and can be read. If not, display an error message and
abort the program. Similarly, see whether the name of the new file already exists. If so, display a
warning message and allow the user to either abort the program , overwrite the existing file, or
enter a new name for the file.
Solution
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
public class Project4
{
public static void main(String[] args)
{
System.out.print(\"Enter file name: \");
Scanner keybaord = new Scanner(System.in);
String fileName = keyboard.next();
Scanner inputStream = null;
System.out.println(fileName);
File fileObject = new File(\"old.txt\");
String path = \"C:\\\\Library\\\\Documents\\\\NetBeansProjects\\\\Project4\";
File source = new File(path);
try
{
inputStream = new Scanner(new File(fileName));
}
catch(FileNotFoundException e)
{
System.out.println(\"Error opening the file \" + fileName);
System.exit(0);
}
while (inputStream.hasNextLine())
{
String line = inputStream.nextLine();
System.out.println(line);
}
inputStream.close();
boolean fileOK = false;
while (!fileOK)
{
if (!fileObject.exists())
System.out.println(\"No such file\");
else if (!fileObject.canRead())
System.out.println(\"That file is not readable.\");
else
fileOK = true;
if (!fileOK)
{
System.out.println(\"Enter the file name again:\");
fileName = keyboard.next();
fileObject = new File(fileName);
}
}
}
public static void PrintWriter openOutputTextFile
{
(String fileName) throws FileNotFoundException
{
PrintWriter toFile = new PrintWriter(fileName);
return toFile;
}
PrintWriter outputStream = null;
try
{
outputStream = openOutputTextFile(\"old.txt\");
}
catch (FileNotFoundException e)
}
}.
Write a program that asks the user for the name of a file. The progr.pdf
The document describes a Java program that prompts the user for a file name, checks if the file exists, and counts the number of words in the file. It provides sample input files with text, and code to open each file, split the contents on whitespace, and count the words. The code outputs the number of words in each valid file.
Os lecture 6
The document discusses the structure of operating systems and the services they provide. It describes how operating systems provide 1) a user interface, 2) program execution, 3) I/O operations, 4) file system manipulation, 5) communications, 6) error detection, and 7) resource allocation. It also discusses how operating systems provide accounting, protection, and security services. The document uses an example of copying a file to illustrate how programs use system calls to request services from the operating system.
Basic i/o & file handling in java
the slide about Exception handling in java and the file and io handling in java .inbuilt java packages in for java exception.for beginner in programming
Copyright © 2018 Pearson Education, Inc. C H A P T E R 6.docx
Copyright © 2018 Pearson Education, Inc.
C H A P T E R 6
Files and Exceptions
Copyright © 2018 Pearson Education, Inc.
TopicsIntroduction to File Input and OutputUsing Loops to Process FilesProcessing RecordsExceptions
Copyright © 2018 Pearson Education, Inc.
Introduction to File Input and OutputFor program to retain data between the times it is run, you must save the data
Data is saved to a file, typically on computer disk
Saved data can be retrieved and used at a later time“Writing data to”: saving data on a fileOutput file: a file that data is written to
Copyright © 2018 Pearson Education, Inc.
Copyright © 2018 Pearson Education, Inc.
Introduction to File Input and Output (cont’d.)“Reading data from”: process of retrieving data from a fileInput file: a file from which data is readThree steps when a program uses a file
Open the file
Process the file
Close the file
Copyright © 2018 Pearson Education, Inc.
Copyright © 2018 Pearson Education, Inc.
Types of Files and File Access MethodsIn general, two types of files
Text file: contains data that has been encoded as text
Binary file: contains data that has not been converted to textTwo ways to access data stored in file
Sequential access: file read sequentially from beginning to end, can’t skip ahead
Direct access: can jump directly to any piece of data in the file
Copyright © 2018 Pearson Education, Inc.
Filenames and File ObjectsFilename extensions: short sequences of characters that appear at the end of a filename preceded by a period
Extension indicates type of data stored in the fileFile object: object associated with a specific file
Provides a way for a program to work with the file: file object referenced by a variable
Copyright © 2018 Pearson Education, Inc.
Filenames and File Objects (cont’d.)
Copyright © 2018 Pearson Education, Inc.
Opening a Fileopen function: used to open a file
Creates a file object and associates it with a file on the disk
General format:
file_object = open(filename, mode)Mode: string specifying how the file will be opened
Example: reading only ('r'), writing ('w'), and appending ('a')
Copyright © 2018 Pearson Education, Inc.
Specifying the Location of a FileIf open function receives a filename that does not contain a path, assumes that file is in same directory as programIf program is running and file is created, it is created in the same directory as the program
Can specify alternative path and file name in the open function argument
Prefix the path string literal with the letter r
Copyright © 2018 Pearson Education, Inc.
Writing Data to a FileMethod: a function that belongs to an object
Performs operations using that objectFile object’s write method used to write data to the file
Format: file_variable.write(string)File should be closed using file object close method
Format: file_variable.close()
Copyright © 2018 Pearson Education, Inc.
Reading Data From a Fileread method: file object method tha.
Exception Handling In Python | Exceptions In Python | Python Programming Tuto...
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This Edureka PPT on Exception Handling Tutorial covers all the important aspects of making use and working with Exceptions using Python. It establishes all of the concepts like explaining why we need exception handling, the process of exception handling and how to go about using it practically.
Agenda
Why need Exception Handling?
What is Exception Handling?
Process of Exception Handling
Coding with Python
Try and Except block in Python
The else clause
The finally clause
Summary
Python Tutorial Playlist: https://goo.gl/WsBpKe
Blog Series: http://bit.ly/2sqmP4s
Instagram: https://www.instagram.com/edureka_lea...
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
File Handling
The document discusses file handling in C programming. It explains that file handling allows programs to store and retrieve data from files for later use, as opposed to just displaying output temporarily. It covers opening, reading from, writing to, and closing files using functions like fopen(), fprintf(), fscanf(), and fclose(). It also differentiates between text files with .txt extensions and binary files for storing different data types permanently in a file.
File Handling
The document discusses file handling in C programming. It explains that file handling allows programs to store and retrieve data from files for later use, as opposed to just displaying output temporarily. It covers opening, reading from, writing to, and closing files using functions like fopen(), fprintf(), fscanf(), and fclose(). It also differentiates between text files with .txt extensions and binary files for storing different data types permanently in a file.
You have to find a way to tie in ALL of the following topics in your m.pdf
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project: -Cellular Reproduction -Meiosis -DNA structure/Function -Bacteria and Archaea -
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You hold a cup of soup when your hand is supinates retracted protracte.pdf
You hold a cup of soup when your hand is supinates retracted protracted pronated Question 14
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errno is an integer variable, defined in errno.h, that is set by sys.pdf
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For example, the error name “ENFILE” has the string description “Too many open files in
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Answer the following questions using a table format.
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a)
b)
In some Unix systems, many system calls can also return EFAULT if given as an argument a
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stack. If this ever happens, you should probably try using statically or dynamically allocated
memory instead of stack memory on that system.
Error Codes
The error code macros are defined in the header file `errno.h\'. All of them expand into integer
constant values. Some of these error codes can\'t occur on the GNU system, but they can occur
using the GNU library on other systems.
Macro: int EPERM
Operation not permitted; only the owner of the file (or other resource) or processes with special
privileges can perform the operation.
Macro: int ENOENT
No such file or directory. This is a \"file doesn\'t exist\" error for ordinary files that are
referenced in contexts where they are expected to already exist.
Macro: int ESRCH
No process matches the specified process ID.
Macro: int EINTR
Interrupted function call; an asynchronous signal occurred and prevented completion of the call.
When this happens, you should try the call again.
You can choose to have functions resume after a signal that is handled, rather than failing with
EINTR; see section Primitives Interrupted by Signals.
Macro: int EIO
Input/output error; usually used for physical read or write errors.
Macro: int ENXIO
No such device or address. The system tried to use the device represented by a file you specified,
and it couldn\'t find the device. This can mean that the device file was installed incorrectly, or
that the physical device is missing or not correctly attached to the computer.
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Argument list too long; used when the arguments passed to a new program being executed with
one of the exec functions (see section Executing a File) occupy too much memory space. This
condition never arises in the GNU system.
Macro: int ENOEXEC
Invalid executable file format. This condition is detected by the exec functions; see section
Executing a File.
Macro: int EBADF
Bad file descriptor; fo.
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The document discusses file handling in C++. It covers the basics of file management including the different types of files, file streams, and the file manipulation process. The key steps in the file manipulation process are: 1) declaring a file stream object; 2) opening a file using the file stream object; 3) checking if the file opened successfully; and 4) performing read and write operations on the file. The document provides examples of writing to and reading from files in C++.
Perfomatix - Java Coding Standards
The worst large application pitfall is maintaining a huge code base with hundreds of dependencies - such a monolith slows down developers as they try to incorporate new features. Instead, partition your code into components, each gets its own folder or a dedicated codebase, and ensure that each unit is kept small and simple.
The ultimate solution is to develop small software: divide the whole stack into self-contained components that don't share files with others, each constitutes very few files (e.g. API, service, data access, test, etc.) so that it's very easy to reason about it.
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The document discusses file input/output (I/O) in Java. It covers:
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2) Exceptions in file I/O and how to handle errors using try/catch blocks.
3) Examples of reading text and binary data from files, writing data to files, and scanning files for specific data.
Introduction To Programming with Python-5
Slides for Lecture 5 of the course: Introduction to Programming with Python offered at ICCBS.
It covers the following topics:
1.)Python Modules
2.)File I/O
3.)Exceptions & Error Handling
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This document summarizes Chapter 6 on I/O streams as an introduction to objects and classes in C++. It discusses streams and basic file I/O, including declaring input and output stream variables to connect to files, reading from and writing to files using extraction and insertion operators, and using member functions like open() and fail() for file operations. The key topics are objects and classes in C++ and how streams are used to perform input and output with files.
Savitch Ch 06
This document summarizes key concepts from a chapter on C++ I/O streams and file I/O:
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- The cin and cout streams connect by default to keyboard input and screen output. File I/O streams like ifstream and ofstream can be used to read from and write to files.
- Member functions like open() are used to connect stream objects to files. The fail() function checks if stream operations like opening a file were successful.
- Programs should check for errors when opening files
Savitch Ch 06
This document discusses input/output (I/O) streams in C++. It covers declaring input and output stream variables to connect to files, using stream member functions like open() to connect streams to files, and extraction and insertion operators to read from and write to streams. It also describes formatting output using stream manipulators and functions like setw(), setprecision(), and flags like fixed and showpoint.
Use Java to program the following.1. Create public java class name.pdf
Use Java to program the following.
1. Create public java class named Benford.
2. It\'s main function should prompt for the name of a data file and then the function iterates
through the all of the elements in the data file and computes the frequency (count and
percentage) of the first number in each entry.
3. Note: Some of the data files have comments that you must filter out.
4. Also note: that blank lines or lines where the number begins or is 0 must also be filtered out.
5. Your output must be formatted as follows.
Solution
Hi Firend, Please find my code.
Please let me know in case of any issue.
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class CountFrequency {
public static void main(String[] args) throws FileNotFoundException {
Scanner sc = new Scanner(System.in);
// taking input file name
System.out.print(\"Enter input file name: \");
String fileName = sc.next();
// opening input file
Scanner inputFile = new Scanner(new File(fileName));
// declaring array to store count of first digit of each entery
int[] frequency = new int[10];
int totalCount = 0; // to maintain total count
int num;
// reading all lines
while(inputFile.hasNextLine()){
// reading current line
String line = inputFile.nextLine();
// if line is not empty
if(line == null || line.isEmpty() || line.trim() == \"\")
continue;
// taking first character of current line
char firstDigit = line.charAt(0);
// if first character is digit and not equal to 0
if(Character.isDigit(firstDigit) && firstDigit != \'0\'){
// converting first character of current line in integer
int d = firstDigit - \'0\';
frequency[d]++;
totalCount++;
}
}
System.out.println(\"Digit\\tCount\\tFrequency\");
for(int i=1; i<=9; i++){
System.out.println(i+\"\\t\"+frequency[i]+\"\\t\"+
((double)frequency[i]/(double)totalCount*100));
}
}
}
/*
Sample run:
##### Entry of input.txt:
453 43
//543
123
0
4ee
875
52
// Output
Enter input file name: input.txt
Digit Count Frequency
1 1 20.0
2 0 0.0
3 0 0.0
4 2 40.0
5 1 20.0
6 0 0.0
7 0 0.0
8 1 20.0
9 0 0.0
*/.
Presentation on-exception-handling
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Exception Handling.ppt
The document discusses exception handling in Java. It covers goals of exception handling like throwing, designing, and catching exceptions. It explains the difference between checked and unchecked exceptions. It discusses separating error handling code from regular code using try/catch blocks. Exceptions allow propagating errors up the call stack. Finally, it provides examples of declaring, catching, and throwing custom exceptions.
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I need help with this Java assignment. Please include comments throu.pdf
I need help with this Java assignment. Please include comments throughout. Thanks
Write a program that will make a copy of a text file, line by line. Read the name of the existing
file and the name of the new file - the copy - from the keyboard. Use the methods of the class
File to test whether the original file exists and can be read. If not, display an error message and
abort the program. Similarly, see whether the name of the new file already exists. If so, display a
warning message and allow the user to either abort the program , overwrite the existing file, or
enter a new name for the file.
Solution
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
public class Project4
{
public static void main(String[] args)
{
System.out.print(\"Enter file name: \");
Scanner keybaord = new Scanner(System.in);
String fileName = keyboard.next();
Scanner inputStream = null;
System.out.println(fileName);
File fileObject = new File(\"old.txt\");
String path = \"C:\\\\Library\\\\Documents\\\\NetBeansProjects\\\\Project4\";
File source = new File(path);
try
{
inputStream = new Scanner(new File(fileName));
}
catch(FileNotFoundException e)
{
System.out.println(\"Error opening the file \" + fileName);
System.exit(0);
}
while (inputStream.hasNextLine())
{
String line = inputStream.nextLine();
System.out.println(line);
}
inputStream.close();
boolean fileOK = false;
while (!fileOK)
{
if (!fileObject.exists())
System.out.println(\"No such file\");
else if (!fileObject.canRead())
System.out.println(\"That file is not readable.\");
else
fileOK = true;
if (!fileOK)
{
System.out.println(\"Enter the file name again:\");
fileName = keyboard.next();
fileObject = new File(fileName);
}
}
}
public static void PrintWriter openOutputTextFile
{
(String fileName) throws FileNotFoundException
{
PrintWriter toFile = new PrintWriter(fileName);
return toFile;
}
PrintWriter outputStream = null;
try
{
outputStream = openOutputTextFile(\"old.txt\");
}
catch (FileNotFoundException e)
}
}.
Write a program that asks the user for the name of a file. The progr.pdf
The document describes a Java program that prompts the user for a file name, checks if the file exists, and counts the number of words in the file. It provides sample input files with text, and code to open each file, split the contents on whitespace, and count the words. The code outputs the number of words in each valid file.
Os lecture 6
The document discusses the structure of operating systems and the services they provide. It describes how operating systems provide 1) a user interface, 2) program execution, 3) I/O operations, 4) file system manipulation, 5) communications, 6) error detection, and 7) resource allocation. It also discusses how operating systems provide accounting, protection, and security services. The document uses an example of copying a file to illustrate how programs use system calls to request services from the operating system.
Basic i/o & file handling in java
the slide about Exception handling in java and the file and io handling in java .inbuilt java packages in for java exception.for beginner in programming
Copyright © 2018 Pearson Education, Inc. C H A P T E R 6.docx
Copyright © 2018 Pearson Education, Inc.
C H A P T E R 6
Files and Exceptions
Copyright © 2018 Pearson Education, Inc.
TopicsIntroduction to File Input and OutputUsing Loops to Process FilesProcessing RecordsExceptions
Copyright © 2018 Pearson Education, Inc.
Introduction to File Input and OutputFor program to retain data between the times it is run, you must save the data
Data is saved to a file, typically on computer disk
Saved data can be retrieved and used at a later time“Writing data to”: saving data on a fileOutput file: a file that data is written to
Copyright © 2018 Pearson Education, Inc.
Copyright © 2018 Pearson Education, Inc.
Introduction to File Input and Output (cont’d.)“Reading data from”: process of retrieving data from a fileInput file: a file from which data is readThree steps when a program uses a file
Open the file
Process the file
Close the file
Copyright © 2018 Pearson Education, Inc.
Copyright © 2018 Pearson Education, Inc.
Types of Files and File Access MethodsIn general, two types of files
Text file: contains data that has been encoded as text
Binary file: contains data that has not been converted to textTwo ways to access data stored in file
Sequential access: file read sequentially from beginning to end, can’t skip ahead
Direct access: can jump directly to any piece of data in the file
Copyright © 2018 Pearson Education, Inc.
Filenames and File ObjectsFilename extensions: short sequences of characters that appear at the end of a filename preceded by a period
Extension indicates type of data stored in the fileFile object: object associated with a specific file
Provides a way for a program to work with the file: file object referenced by a variable
Copyright © 2018 Pearson Education, Inc.
Filenames and File Objects (cont’d.)
Copyright © 2018 Pearson Education, Inc.
Opening a Fileopen function: used to open a file
Creates a file object and associates it with a file on the disk
General format:
file_object = open(filename, mode)Mode: string specifying how the file will be opened
Example: reading only ('r'), writing ('w'), and appending ('a')
Copyright © 2018 Pearson Education, Inc.
Specifying the Location of a FileIf open function receives a filename that does not contain a path, assumes that file is in same directory as programIf program is running and file is created, it is created in the same directory as the program
Can specify alternative path and file name in the open function argument
Prefix the path string literal with the letter r
Copyright © 2018 Pearson Education, Inc.
Writing Data to a FileMethod: a function that belongs to an object
Performs operations using that objectFile object’s write method used to write data to the file
Format: file_variable.write(string)File should be closed using file object close method
Format: file_variable.close()
Copyright © 2018 Pearson Education, Inc.
Reading Data From a Fileread method: file object method tha.
Exception Handling In Python | Exceptions In Python | Python Programming Tuto...
** Python Certification Training: https://www.edureka.co/python-programming-certification-training **
This Edureka PPT on Exception Handling Tutorial covers all the important aspects of making use and working with Exceptions using Python. It establishes all of the concepts like explaining why we need exception handling, the process of exception handling and how to go about using it practically.
Agenda
Why need Exception Handling?
What is Exception Handling?
Process of Exception Handling
Coding with Python
Try and Except block in Python
The else clause
The finally clause
Summary
Python Tutorial Playlist: https://goo.gl/WsBpKe
Blog Series: http://bit.ly/2sqmP4s
Instagram: https://www.instagram.com/edureka_lea...
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
File Handling
The document discusses file handling in C programming. It explains that file handling allows programs to store and retrieve data from files for later use, as opposed to just displaying output temporarily. It covers opening, reading from, writing to, and closing files using functions like fopen(), fprintf(), fscanf(), and fclose(). It also differentiates between text files with .txt extensions and binary files for storing different data types permanently in a file.
File Handling
The document discusses file handling in C programming. It explains that file handling allows programs to store and retrieve data from files for later use, as opposed to just displaying output temporarily. It covers opening, reading from, writing to, and closing files using functions like fopen(), fprintf(), fscanf(), and fclose(). It also differentiates between text files with .txt extensions and binary files for storing different data types permanently in a file.
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Use Java to program the following.1. Create public java class name.pdf
Use Java to program the following.1. Create public java class name.pdf
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I need help with this Java assignment. Please include comments throu.pdf
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Copyright © 2018 Pearson Education, Inc. C H A P T E R 6.docx
Copyright © 2018 Pearson Education, Inc. C H A P T E R 6.docx
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