Question

In C programming language, write the program "3x3" in size, calculating the matrix "c = a * b" by reading the a and b matrices from the outside and writing on the screen?

Answer 1

C Program:

#include <stdio.h>
#include <stdlib.h>

#define RMAX 10
#define CMAX 10

int main()
{
    int i, j, k, r, c;

    int A[RMAX][CMAX], B[RMAX][CMAX], Z[RMAX][CMAX];

    printf("Enter #rows #columns: ");
    scanf("%d %d", &r, &c);

    //Reading matrix
    printf("\n Enter %d elements for matrix A: ", (r*c));

    //Iterating over rows
    for(i=0; i<r; i++)
    {
        //Iterating over columns
        for(j=0; j<c; j++)
        {
            scanf("%d", &A[i][j]);
        }
    }

    //Reading matrix
    printf("\n Enter %d elements for matrix B: ", (r*c));

    //Iterating over rows
    for(i=0; i<c; i++)
    {
        //Iterating over columns
        for(j=0; j<r; j++)
        {
            scanf("%d", &B[i][j]);
        }
    }

    //Matrix Multiplication
    for(i=0; i<r; i++)
    {
        //Iterating over columns
        for(j=0; j<r; j++)
        {
            //Set to zero
            Z[i][j] = 0;

            for(k=0; k<c; k++)
            {
                //Matrix Multiplication
                Z[i][j] += (A[i][k] * B[k][j]);
            }
        }
    }

    //Printing matrix Z
    printf("\n Matrix Z: \n\n");

    //Iterating over rows
    for(i=0; i<r; i++)
    {
        //Iterating over columns
        for(j=0; j<r; j++)
        {
            printf("%d\t", Z[i][j]);
        }
        printf("\n");
    }

    printf("\n");
    return 0;
}