C Program to Compute the Product of Two Matrices

#include < stdio.h>
#define MAXROWS 10
#define MAXCOLS 10
 
void readMatrix(int arr[][MAXCOLS], int m, int n);
void printMatrix(int arr[][MAXCOLS], int m, int n);
void productMatrix(int array1[][MAXCOLS], int array2[][MAXCOLS],
int array3[][MAXCOLS], int m, int n);
 
void main()
{
    int array1[MAXROWS][MAXCOLS], array2[MAXROWS][MAXCOLS],
    array3[MAXROWS][MAXCOLS];
    int m, n;
 
    printf("Enter the value of m and n \n" );
    scanf("%d %d" , &m, &n);
    printf("Enter Matrix array1 \n" );
    readMatrix(array1, m, n);
    printf("Matrix array1 \n" );
    printMatrix(array1, m, n);
    printf("Enter Matrix array2 \n" );
    readMatrix(array2, m, n);
    printf("Matrix B \n" );
    printMatrix(array2, m, n);
    productMatrix(array1, array2, array3, m, n);
    printf("The product matrix is \n" );
    printMatrix(array3, m, n);
}
/*  Input Matrix array1 */
void readMatrix(int arr[][MAXCOLS], int m, int n)
{
    int i, j;
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            scanf("%d" , &arr[i][j]);
        }
    }
}
void printMatrix(int arr[][MAXCOLS], int m, int n)
{
    int i, j;
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            printf("%3d" , arr[i][j]);
        }
        printf("\n" );
    }
}
/*  Multiplication of matrices */
void productMatrix(int array1[][MAXCOLS], int array2[][MAXCOLS],
int array3[][MAXCOLS], int m, int n)
{
    int i, j, k;
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            array3[i][j] = 0;
            for (k = 0; k < n; k++)
            {
                array3[i][j] = array3[i][j] + array1[i][k] *
                array2[k][j];
            }
        }
    }
}

Output

 Enter the value of m and n
 3   3 
Enter matrix array1
 4   5   6 
 1   2   3 
 3   7   8 
Matrix array1
   4    5    6 
   1    2    3 
   3    7    8 
Enter matrix array2
 5   6   9 
 8   5   3 
 2   9   1 
Matrix array2
   5    6    9 
   8    5    3 
   2    9    1 
The product matrix is
  72103   57 
  27   43   18 
  87125   56 

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