I need to calculate each students average grade [closed] - c++

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/*This code creates two text files : Mokiniai.txt and Vidurkiai.txt
In Mokiniai.txt there are stored each students grades, in Vidurkiai there
should be calculated each students average grade*/
#include "stdafx.h"
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
int n, k, isvisopazymiu, i, pazymiai;
double vidurkis; //average grade
ofstream myfile;
myfile.open("Mokiniai.txt");
cout << "parasykite kiek mokiniu yra" << endl; cin >> n; //how many students
myfile << n << endl;
cout << "parasykite kiek yra mokiniu pazymiu"; cin >> isvisopazymiu; // how many grades one student has
for (k = 1; k <= n; k++) {
for (i = 1; i <= isvisopazymiu; i++) {
cout << "Parasykite kokie yra mokiniu pazymiai "; cin >> pazymiai; // what are students grades
myfile << " " << pazymiai;
}
myfile << endl;
}
myfile.close();
myfile.open("Vidurkiai.txt"); //trying to calculate average students grades on different file
for (k = 1; k <= n; k++) {
vidurkis = pazymiai / isvisopazymiu; //calculating students grades
myfile << k << " " << vidurkis << endl;
}
myfile.close();
return 0;
}
My problem is that: There is something wrong in vidurkiai.txt file, but I don't know what is wrong.
For example: first students grades are : 7 8 9 7 8, and average grade should be 7,8, but after coding it, in vidurkiai.txt file it shows, that average grade is 1.

Answer 1

The reason why it does not show the grades as expected is because you are not adding up the values.While taking the average over all the grades variable
'pazymiai' stores just the last entered variable. In order to complete the job you can use an 'array' to stores sum of grades in each array element .
cin>>pazymiai;
a[k]+=pazymiai;
where as while calculating grades use
vidurkis = a[k] / isvisopazymiu;