Question

Hello I need help with this simple C++ program.

Write a program to calculate the average of a set of integer values placed in an input file called “data.txt”; you may create your own input file. We however do not know the number of values listed in this input file and your program should be written in a way to handle any file. Make sure to submit your input file in addition to a copy of the program and its output.

Answer 1

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

using namespace std;

int main() {
    ifstream in("data.txt");
    if (in.is_open()) {
        double total = 0, count = 0, num;
        while (in >> num) {
            total += num;
            ++count;
        }
        cout << "Average of all numbers in file is " << total / count << endl;
        in.close();
    } else {
        cout << "data.txt does not exists!" << endl;
    }
    return 0;
}

7 9 1 5

Average of all numbers in file is 5.5