sum matrix

/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <iostream>

using namespace std;

int
main ()
{

  int n[3][3];
  int m[3][3];
  int a[3][3];
  for (int i = 0; i < 3; i++)
    {
      for (int j = 0; j < 3; j++)
    {
      cout << "enter " << i << j << "element for n = ";
      cin >> n[i][j];
      cout << "enter " << i << j << "element for m = ";
      cin >> m[i][j];
      a[i][j] = n[i][j] + m[i][j];
    }
    }
  for (int i = 0; i < 3; i++)
    {
      for (int j = 0; j < 3; j++)
    {
      cout << a[i][j] << " ";

    }
      cout << endl;
    }

  return 0;
}