Question

Needs some help [User-Defined Function] C++

Write a function, readWrite, that reads a set of test scores stored in a file and calculates and returns the average of the numbers. The function returns a double and has the name of the file as its parameter. If the data is as follows, the average will be 5.66.

3

6

8

Answer 1

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

double readWrite(string filename) {
    ifstream in(filename.c_str());
    if (in.is_open()) {
        double total = 0, num, count = 0;
        while (in >> num) {
            total += num;
            count++;
        }
        return total / count;
    } else {
        return 0;
    }
}

int main() {
    string filename;
    cout << "Enter file name: ";
    cin >> filename;
    cout << readWrite(filename) << endl;
    return 0;
}