File I/O Functions Part -II

C. Writing to a File

Writing to a file in C++ is similar to printing output to the terminal. To write to a file, one creates an object of type ofstream and specifies the name and extension of the file. Then, use the insertion operator (<<) to add content to the file.

Here’s an example to demonstrate how to write to a file.

#include <iostream>
#include <fstream>
 
using namespace std;
 
int main()
{
    string str = "Welcome_To_studentproject!";
    ofstream out("example.txt");
    out << str;
    out.close();
    return 0;
}

Output:

Welcome_To_studentproject!

D. Reading a file

Reading from a file in C++ is similar to reading input from the terminal. To read from a file, you need to create an object of the type ifstream and specify the name of the file along with its extension. You then use the extraction operator (>>) to extract data from the file fed to the object. An example is provided to demonstrate how to read from a file.

#include <iostream>
#include <fstream>
 
using namespace std;
 
int main()
{
    string str;
    ifstream in("example.txt");
    in >> str;
    cout << str;
    return 0;
}

The file example.txt had “Welcome_To_studentproject!” as its content, hence the output:

Welcome_To_studentproject!