Important File Handling Functions
File Handling:
In C++, file handling allows programs to store data in files and perform various operations on
them. Files can be used to save program output or retrieve data for processing.
A stream is a concept that represents a source or destination for data, like a file or a console. In
C++, there are three main classes for file handling:
1. ofstream: Used to create and write data to a file.
2. ifstream: Used to read data from a file.
3. fstream: Can both read from and write to a file.
These classes are part of the fstream library, so you need to include this header when working
with files in C++.
1. Opening a File (open() function)
The open() function is used to open a file in different modes (read, write, append, etc.).
Syntax:
fstream file;
file.open("example.txt", ios::out); // Opens file for writing
2. Writing to a File (write operation)
The << operator is used to write data into a file.
Example:
fstream file;
file.open("example.txt", ios::out);
file << "Hello, File Handling!"; // Writing to file
file.close(); // Always close the file after use
3. Reading from a File (read operation)
The >> operator is used to read data from a file.
