Sample C Program To Multiply Two Matrices.

#include <stdio.h>
#include <conio.h>

int main()
{

int m, n, p, q, i, j, k, sum = 0;
int first[10][10], second[10][10], mul[10][10];

printf(" Enter the number of rows and columns of first matrix " );
scanf(" %d %d ", &m, &n );
printf(" Enter the elements of first matrix\n " );

for ( i = 0 ; i < m ; i++ )
     for ( j = 0 ; j < n ; j++ )
          scanf(" %d ", &first[i][j] );

printf(" Enter the number of rows and columns of first matrix " );
scanf(" %d %d ", &p, &q );

if ( n != p )
      printf(" Matrices with entered orders can't be multiplied with each other." );
else
  {
      printf(" Enter the elements of second matrix\n " );

      for ( i = 0 ; i < p ; i++ )
           for ( j = 0 ; j < q ; j++ )
                scanf(" %d ", &second[i][j] );

      for ( i = 0 ; i < m ; i++ )
         {
            for ( j = 0 ; j < n ; j++ )
              {
                  for ( k = 0 ; k < p ; k++ )
                     {
                        sum = sum + first[ i ] [ k ] * second[ k ] [ j ];
                     }

                  mul[ i ] [ j ] = sum;
                  sum = 0;
              }
         }

      printf(" Product of entered matrices:-\n " );

      for ( i = 0 ; i < m ; i++ )
        {
           for ( j = 0 ; j < q ; j++ )
                printf(" %d \t ", mul[ i ] [ j ] );

           printf("\n");
        }
  }

getch();
return 0;

}

OUTPUT:

Enter the number of rows and columns of first matrix 2
2

Enter the elements of first matrix
1
5
6
4

Enter the number of rows and columns of second matrix 2
2

Enter the elements of second matrix
1
2
4
6

Product of entered matrices:-
21        32
22        36


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