C++ program to demonstrate reading from two files.

 Objective: Write a C++ program to demonstrate reading from two files simultaneously.

Code:

#include <iostream>

#include <fstream>

#include <string>

using namespace std;

int main() {

    // Input file streams for reading data from two files

    ifstream inFile1, inFile2;

    // Open the first file

    inFile1.open("file1.txt");

    if (!inFile1) {

        cout << "Error opening file1.txt!" << endl;

        return 1;

    }

    // Open the second file

    inFile2.open("file2.txt");

    if (!inFile2) {

        cout << "Error opening file2.txt!" << endl;

        inFile1.close();  // Close the first file if the second file fails to open

        return 1;

    }

    // Variables to store lines read from each file

    string line1, line2;

    // Read from both files simultaneously

    while (getline(inFile1, line1) && getline(inFile2, line2)) {

        cout << "File1: " << line1 << endl;

        cout << "File2: " << line2 << endl;

    }

    // If one file has more lines, read and display the remaining lines

    while (getline(inFile1, line1)) {

        cout << "File1: " << line1 << endl;

    }

    while (getline(inFile2, line2)) {

        cout << "File2: " << line2 << endl;

    }

    // Close the files

    inFile1.close();

    inFile2.close();

    return 0;

}

Output: