Question

using C++ , write a program that will open a file called "first.txt" and will count how many lines are in the file.

Inside the file "first.txt" looks like below but without the spaces inbetween.

S

D

D

F

G

H

J

Answer 1

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main() {
    ifstream in("first.txt");   // open file to read
    if (in.is_open()) { // open file to read
        int count = 0;  // set count to 0
        string line;
        while (getline(in, line)) {    // read from file line by line
            ++count;    // increment count by 1, everytime a line is read.
        }
        cout << "Number of lines in first.txt is " << count << endl;    // print number of lines are in file
        in.close(); // close file
    } else {    // if file does not exists
        cout << "first.txt does not exists!" << endl;   // then report that to user
    }
    return 0;
}