#include <iostream>

#include <cmath>

#include <math.h>

#include <fstream>

#include <string>

#include <numeric>

using namespace std;

int main()

{

ifstream infile;

float num;

float total;

float x;

float aver;

x=0; total=0;

infile.open("Exercise13_3.txt");

while(!infile.eof())

{

infile>>num;

total=total+num;

x++;

}

aver=(total-num)/(x-1);

cout << "Number of grades = " <<x<< "\n";

cout<< "Total of all grades = " <<total<<'\n';

cout<< "Average grade = "<<aver<<'\n';

cout<< ""<<'\n';

semoga membantu

Maaf kalo salah.