C program to find matrix multiplication

C program to find matrix multiplication


Input:

Enter the elements of array a:
1 2 3
4 5 6
7 8 9
Enter the elements of array b:
1 2 3
4 5 6
7 8 9

Output:

The result matrix 3x1 of sum is:
30
81
150

Implementation:

#include <stdio.h> #define r 3 #define c 3 int main(void) { int a[r][c],b[r][c],sum[r][1]={0}; int i,j; printf("Enter the elements of array a:\n"); for(i=0;i<r;i++) { for(j=0;j<c;j++) { scanf("%d",&a[i][j]); } } printf("Enter the elements of array b:\n"); for(i=0;i<r;i++) { for(j=0;j<c;j++) { scanf("%d",&b[i][j]); } } /* matrix multiplication arrows indicate the multiplication way -----> 1 2 3 a=4 5 6 7 8 9 | 1 2 3 b=| 4 5 6 v 7 8 9 1*1 + 2*4 + 3*7 c=4*2 + 5*5 + 6*8 7*3 + 8*6 + 9*9 */ for(i=0;i<r;i++) { for(j=0;j<c;j++) { sum[i][0] += a[i][j]*b[j][i]; } } /* printing the result */ printf("The result matrix 3x1 of sum is:\n"); for(i=0;i<r;i++) { printf("%d\n",sum[i][0]); } return 0; }