C++ Reading from a file Program

Hello Everyone!

In this tutorial, we will learn how to open and read the contents of a file, in the C++ programming language.

To understand this concept from basics, we will highly recommend you to refer to this: C++ File Stream, where we have discussed this concept and the various terminologies involved in it, in detail.

The step by step commented code can be seen below:

Code:

#include<iostream>
#include<fstream>  //to make use of system defined functions for file handling

using namespace std;

int main()
{
    cout << "\n\nWelcome to Studytonight :-)\n\n\n";
    cout << " =====  Program to demonstrate how to read the contents from a file ===== \n\n";

    //declaration of a string variable
    string str;

    // creating a variable of type ifstream to make use of file handling commands and open a file in read mode.
    ifstream in;

    //open is a system defined method to open and read from the mentioned file
    in.open("studytonight.txt");

    //Make sure that the file is within the same folder as that of this program otherwise, will have to provide the entire path to the file to read from

    cout << "Reading content from the file and it's contents are: \n\n";

    // printing the data word by word
    while(in>>str)
        cout << str << " ";
    
    cout << "\n\n\n";

    // close the file opened before.
    in.close();

    return 0;
}

The contents of the studytonight.txt file are:

Studytonight: Our mission is to empower young Students to be the inventors and creators.

Output :

We hope that this post helped you develop a better understanding of the concept of reading the contents from a file, in C++. For any query, feel free to reach out to us via the comments section down below.

Keep Learning : )