The document discusses C++ file input/output (I/O) streams and operations. It introduces the fstream, ifstream, and ofstream classes used to read from, write to, and read/write files. Examples show opening a file with the open() function, writing text to a file using ofstream, and formatting output using I/O manipulators. Common file operations like opening, writing, and closing are demonstrated.
Data File Handiling File POINTERS IN C++subham sahu
Understanding of file pointers ,seekg() , tellg(), seekp() and tellp().How to place a pointer to a right place in file.File operation with File pointer.File pointer examples,programs.
Python too supports file handling and allows users to handle files i.e., to read and write files, along with many other file handling options, to operate on files. The concept of file handling has stretched over various other languages, but the implementation is either complicated or lengthy, but alike other concepts of Python, this concept here is also easy and short. Python treats file differently as text or binary and this is important. Each line of code includes a sequence of characters and they form text file. Each line of a file is terminated with a special character, called the EOL or End of Line characters like comma {,} or newline character. It ends the current line and tells the interpreter a new one has begun. Let’s start with Reading and Writing files.
This is a very short 30-minutes talk that I gave to a barcelona python developers meeting.
It explain a proposal to use doctest for biopython documentation (and in general, in bioinformatics).
It also contains an introduction and the use of automated build tools in bioinformatics, like make and scons.
Data File Handiling File POINTERS IN C++subham sahu
Understanding of file pointers ,seekg() , tellg(), seekp() and tellp().How to place a pointer to a right place in file.File operation with File pointer.File pointer examples,programs.
Python too supports file handling and allows users to handle files i.e., to read and write files, along with many other file handling options, to operate on files. The concept of file handling has stretched over various other languages, but the implementation is either complicated or lengthy, but alike other concepts of Python, this concept here is also easy and short. Python treats file differently as text or binary and this is important. Each line of code includes a sequence of characters and they form text file. Each line of a file is terminated with a special character, called the EOL or End of Line characters like comma {,} or newline character. It ends the current line and tells the interpreter a new one has begun. Let’s start with Reading and Writing files.
This is a very short 30-minutes talk that I gave to a barcelona python developers meeting.
It explain a proposal to use doctest for biopython documentation (and in general, in bioinformatics).
It also contains an introduction and the use of automated build tools in bioinformatics, like make and scons.
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
File Handling is used in C language for store a data permanently in computer.
Using file handling you can store your data in Hard disk.
http://www.tutorial4us.com/cprogramming/c-file-handling
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
File Handling is used in C language for store a data permanently in computer.
Using file handling you can store your data in Hard disk.
http://www.tutorial4us.com/cprogramming/c-file-handling
ExplanationThe files into which we are writing the date area called.pdfaquacare2008
Explanation:The files into which we are writing the date area called as output files.If we want to
write the result of the program in the user required format we can write in these files.
2.2) When storing and retrieving data, a sequential access file is much like a VCR tapes
In floppy disks and hard disks data retrieval and storing will be done in Random wise.But this is
not possible in case of VCR tapes.this is the disadvante of this.That why now a days we are using
hard disks to store data.
3.3) If you want to add data to an new file, what is the correct operation to perform?
Ans) create a file
4.4) To create an output file object, you would use what kind of type?
Ans)ofstream
Syntax: ofstream myfile;
myfile.open (\"D:\\\\bankbal.txt\");
5.5) What do the following statements accomplish?
ofstream theFile;
theFile.open( myFile.txt , ios::app);
Ans) Opens myFile in append mode
ios::app – If we opened a file in this mode,If any content we are writing will be appended to the
end of the file.I.e the new content we are wrinting will be appended to the end of the already
existing content.
6.6) When a file is opened in output mode, the file pointer is positioned at the beginning of the
file.
For input file and output file the pointer will we positioned at the beginning of the file only.
7.7) The is_open function returns what kind of data type?
Ans)bool
If(myfile.is_open) we use this to check whether the file opened successfully or not.
8.8) In general, which of the following contains the least amount of data?
Ans)byte
We can store only a single character or single number or single symbol in this byte.like ‘a’,7,#
9.9) To use an output file, the program must include fstream
Explanation: If we want to use either an input file or an output file we have to include fstream.h
header file. Like #include
10.10) Which of the following is not true about files?
Ans) istream, ostream, and iostream are derived from ifstream, ofstream, and fstream,
respectively.
11.11) Compare and contrast the mode operators ios::in, ios::app, and ios::out. Provide a C++
code segment that illustrates the use of these mode operators.
Ans)
To open a file we have to use this member function.
As a first argument we have to supply the filename.
As a second argument we can supply the mode of opening the file.this is an optional parameter.
Syntax: open(filename,mode);
ios::in – if we want to read the data from the file we have to use this mode.This is used for input
operations.
Code:
ifstream file;
file.open(\"D:\\\\bank.txt\"); or file.open(\"D:\\\\bank.txt\",ios::in);
here we are trying to read the data from the file named bank.txt which is available in D
drive.Here we didn’t specify the mode here.By default the file will be opened in ios::in mode
ios::out - if we want to write the data from to a file we have to use this mode.This is used for
output operations.
Code:
ofstream myfile;
myfile.open (\"D:\\\\bankbal.txt\"); or myfile.open (\"D:\\\\bankbal.txt\", ios::out);
myfile <<”Hell.
COURSE TITLE: SOFTWARE DEVELOPMENT VI
COURSE CODE: VIT 351
TOPICS COVERED:
FILES
FILES I/O STREAM
TYPES OF FILES
DRAWBACKS OF TRADITIONAL METHOD OF DATA STORAGE
CONCEPT OF BUFFER
MODES OF FILE OPENING
END OF FILE
PROCESSORS DIRECTIVES
MACROS
TYPES OF MACROS
DIFFERENCE BETWEEN MACROS AND FUNCTIONS
QUIZ SET 5
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
1. I/O System Basics, File I/O UNIT 7
1 | P a g e A n a n d a K u m a r H N
I/O System Basics, File I/0: C++ stream classes, Formatted I/O, I/O manipulators,
fstream and the File classes, File operations
/* Normal C++ output*/
#include<iostream>
using namespace std;
int main()
{
cout<<"ATME"<<endl<<endl;
}
OUTPUT:
/*Formatted output*/
#include<iostream>
using namespace std;
int main()
{
cout.setf(ios::right);
cout.width(20);
cout<<"ATME"<<endl<<endl;
}
OUTPUT:
/* width( ) fill( ) setf( ) */
Example 1:
#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
cout.precision(7);
cout.fill('*'); //fill function
cout.width(19); // width function
cout.setf(ios::right);// setting flag
cout<<52.1234567<<endl;
cout<<setfill('?')<<setw(30);
cout<<"ATME"<<endl<<endl;
}
OUTPUT:
Example 2:
#include<iostream>
using namespace std;
int main()
{
cout.setf(ios::right);
cout.fill('$');
cout.width(20);
cout<<"ATME"<<endl<<endl;
}
OUTPUT:
/* showpos flag */
#include<iostream>
using namespace std;
int main()
{
int x=1000;
cout.setf(ios::showpos);
cout.fill('$');
cout.width(10);
cout<<"x="<<x<<endl<<endl;
}
OUTPUT:
/* showpoint flag */
#include<iostream>
using namespace std;
int main()
{
float x=1000;
cout.setf(ios::showpos);
cout.setf(ios::showpoint);
cout.fill('$');
cout.width(10);
cout<<"x="<<x<<endl<<endl;
}
OUTPUT:
2. I/O System Basics, File I/O UNIT 7
2 | P a g e A n a n d a K u m a r H N
/* Scientific flag */
#include<iostream>
using namespace std;
int main()
{
float x=1000.123;
cout.setf(ios::scientific);
cout.width(10);
cout<<"x="<<x<<endl<<endl;
}
OUTPUT:
#include<iostream>
using namespace std;
int main()
{
cout.precision(7);
cout.fill('*'); //fill function
cout.width(19); // width function
cout.setf(ios::left);// setting flag
cout.setf(ios::scientific);
cout<<52.1234567<<endl;
cout<<endl<<"unsetting flags"<<endl;
cout.unsetf(ios::left);
cout.unsetf(ios::scientific);
cout<<52.1234567<<endl;
}
OUTPUT:
/*C++ Manipulators */
#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
float x=188.9298;
cout<<hex<<100<<endl;
cout<<setfill('#')<<setw(20)<<x;
}
OUTPUT:
fstream and the File classes:
• ofstream: Stream class to write on files
• ifstream: Stream class to read from files
• fstream: Stream class to both read and write from/to
files.
These classes are derived directly or indirectly from
the classes istream, and ostream. We have already used
objects whose types were these classes: cin is an object
of class istream and cout is an object of class ostream.
Therfore, we have already been using classes that are
related to our file streams. And in fact, we can use our
filestreams the same way we are already used to use
cin and cout, with the only difference that we have to
associate these streams with physical files.
Let's see an example:
This code creates a file called example.txt and inserts a
sentence into it in the same way we are used to do with
cout, but using the file stream myfile instead.
// basic file operations
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ofstream myfile;
myfile.open ("example.txt");
myfile << "Writing this to a file.n";
myfile.close();
return 0;
}
OUTPUT:
This program will create a txt file with filename as
example and it writes line "Writing this to a file.” And
closes the file.
Open a file:
The first operation generally performed on an object of
one of these classes is to associate it to a real file. This
procedure is known as to open a file. An open file is
represented within a program by a stream object
(an instantiation of one of these classes, in the previous
example this was myfile) and any input or output
operation performed on this stream object will be
applied to the physical file associated to it.
In order to open a file with a stream object we use its
member function open():
open (filename, mode);
Where filename is a null-terminated character
sequence of type const char * (the same type that
3. I/O System Basics, File I/O UNIT 7
2 | P a g e A n a n d a K u m a r H N
/* Scientific flag */
#include<iostream>
using namespace std;
int main()
{
float x=1000.123;
cout.setf(ios::scientific);
cout.width(10);
cout<<"x="<<x<<endl<<endl;
}
OUTPUT:
#include<iostream>
using namespace std;
int main()
{
cout.precision(7);
cout.fill('*'); //fill function
cout.width(19); // width function
cout.setf(ios::left);// setting flag
cout.setf(ios::scientific);
cout<<52.1234567<<endl;
cout<<endl<<"unsetting flags"<<endl;
cout.unsetf(ios::left);
cout.unsetf(ios::scientific);
cout<<52.1234567<<endl;
}
OUTPUT:
/*C++ Manipulators */
#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
float x=188.9298;
cout<<hex<<100<<endl;
cout<<setfill('#')<<setw(20)<<x;
}
OUTPUT:
fstream and the File classes:
• ofstream: Stream class to write on files
• ifstream: Stream class to read from files
• fstream: Stream class to both read and write from/to
files.
These classes are derived directly or indirectly from
the classes istream, and ostream. We have already used
objects whose types were these classes: cin is an object
of class istream and cout is an object of class ostream.
Therfore, we have already been using classes that are
related to our file streams. And in fact, we can use our
filestreams the same way we are already used to use
cin and cout, with the only difference that we have to
associate these streams with physical files.
Let's see an example:
This code creates a file called example.txt and inserts a
sentence into it in the same way we are used to do with
cout, but using the file stream myfile instead.
// basic file operations
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ofstream myfile;
myfile.open ("example.txt");
myfile << "Writing this to a file.n";
myfile.close();
return 0;
}
OUTPUT:
This program will create a txt file with filename as
example and it writes line "Writing this to a file.” And
closes the file.
Open a file:
The first operation generally performed on an object of
one of these classes is to associate it to a real file. This
procedure is known as to open a file. An open file is
represented within a program by a stream object
(an instantiation of one of these classes, in the previous
example this was myfile) and any input or output
operation performed on this stream object will be
applied to the physical file associated to it.
In order to open a file with a stream object we use its
member function open():
open (filename, mode);
Where filename is a null-terminated character
sequence of type const char * (the same type that