Summarize then average every 10 lines from a txt file

Question

I have this code for the task mentioned in the title:

The program reads from a 1 columned text file in which the numbers are below each other.

#include <iostream>
#include <fstream>

using namespace std;

int main()
{

    double number;
    double sum = 0;

    ifstream average;
    average.open("average.txt");

    while (average >> number)
    {
        for(int i = 0; i < 10; i++)
        {
            sum = sum + number;

            i++;

            if (i = 9)
            {
                cout << sum / 10 << endl;
            }
         }
    {

    average.close();
    system("pause");
    return 0;
}

But somehow it doesn't average the numbers just divide all of them by 10.

What might be the problem?

Thanks

Answer 1

A possible solution:

int i;
while (average.good()) // only while we are good
{
  sum = 0; // you need to clean it
  for(i = 0; i < 10; i++)
  {   
    average >> number;

    if (!average.good()) break; // if number of lines is not mod10

    sum = sum + number;
    // i++; you already do that in for loop
  }
  if (i)
  {
    cout << sum / i << endl; // only print after each 10 or less
  }
}

Or with the single loop:

sum = 0;
int i = 0;

while (average >> number) {
  sum = sum + number;
  ++i;

  if (i == 10) {
    cout << sum / i << endl;
    sum = i = 0;
  }
}
if (i) {
  cout << sum / i << endl;
}