displaying commas in loop

[i8T4izwU]

If the number 4 is entered, the output should be the following:

1: 1
2: 1, 2
3: 1, 3
4: 1, 2, 4,

My output, however, is different but I know its an error with the comma.f

1: 1, , ,
2: 1, 2, ,
3: 1, , 3,
4: 1, 2, , 4

Any help with this little comma problem is greatly appreciated!

Here is my code:

#include <iostream>
using namespace std;
 

int main()
{
  int n(0), j(0);
  int i(0); 

  cout << "Enter integer: ";
  cin >> n;

   while (n < 1)
    {
      cout << "Number must be positive." << endl;
      cout << "Enter integer: ";
      cin >> n;
    }
  cout << endl;

      cout << "Factors of all numbers up to " << n << endl;

  for (i = 1; i <= n; i++)
    {
      cout << i << ": ";

      for (j = 1; j <= n; j++)
    {
      if (i % j == 0)
      {
        cout << j;
      }

        if (j != i)
        {
          cout << ", ";
          }
    }
      cout << endl;
    }
}

[Yanson]

Please don't double post