Question

create a program that sum value from a txt file in c++,the data in the txt file are in columns

Answer 1

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

using namespace std;

int main() {
    string filename;
    cout << "Enter file name: ";
    cin >> filename;
    ifstream in(filename.c_str());
    if (in.is_open()) {
        int num, total = 0;
        while (in >> num) {
            count++;
            total += num;
        }
        cout << "The sum of all the numbers in the file: " << total << endl;
    } else {
        cout << "can not open " << filename << endl;
    }
    return 0;
}