Multiplying Dynamic Arrays

[firstlast]

This code will compile and give my results, although I don't if this is correct. If I make the array 2X2, and I make each matrix:

1,1
1,1

2,2
2,2

I get this as a result:

3,6
3,6

#include <iostream>

using namespace std;

int main()
{
	//Preconditions: Arrays must have equal dimensions
	//Postconditions: Multiplies the contents of the two arrays

     int a1[20][20];
	 int a2[20][20];
     int product[20][20];
     int d1,d2;
     int i,j,k;

     cout << "Enter the number of row and column dimensions of the array: \n";
		 cin >> d1 >> d2;

     cout << "Enter the elements in your first matrix\n";
     for (i = 0; i < d1; i++)
     {
          for (j = 0; j < d2; j++)
          {
               cout << "Element " << i << "," << j << " = ";
				 cin >> a1[i][j];
          }
     }

     cout << "Enter the elements in your second matrix : \n";
     for (i = 0; i < d1; i++)
     {
          for (j = 0; j < d2; j++)
          {
               cout << "Element " << i << "," << j <<" = ";
				 cin >> a2[i][j];
          }
     }

	 cout << "First Matrix \n";
     for (i = 0; i < d1; i++)
     {
          for (j = 0; j < d2; j++)
          {
               cout << " " << a1[i][j];
          }
          cout << "\n";
     }

     cout << "Second Matrix \n";
     for (i = 0; i < d1; i++)
     {
          for (j = 0; j < d2; j++)
          {
               cout << " " << a2[i][j];
          }
          cout << "\n";
     }

    cout << "The product of two matrices \n";
     for(i = 0; i < d1; i++)
     {
          for(j = 0; j < d2; j++)
          {
            product[i][j] = 0;
			for(k = 0; k < d1; k++)
			{
               product[i][j] = product[i][j] + a1[i][k] * a2[k][j];
			}
		  } 
	 }

	 for (i = 0; i < d1; i++)
     {
          for (j = 0; j < d2; j++)
          {
               cout << " " << product[i][j];
          }
          cout << "\n";
     }

     return 0;
}

My problem is that I think the multiplication is off...

[TheKingOfTyrants]

Interesting. When I run the program, I'm getting the correct result of an all-4 matrix. :/