Question

Write a program to multiply any two 3 x 3 matrices

Answer 1

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




int main() {
	srand(time(NULL));




	const int N = 3;




	int a[N][N];
	int b[N][N];
	int result[N][N];


	int i = 0;
	int j = 0;


	for (i = 0; i < N; i++)
		for (j = 0; j < N; j++) {
			a[i][j] = rand() % 10;
			b[i][j] = rand() % 10;
			result[i][j] = 0;
		}




	printf("First matrix:\n");
	for (i = 0; i < N; i++) {
		for (j = 0; j < N; j++)
			printf("%d ", a[i][j]);
		printf("\n");
	}


	printf("Second matrix:\n");
	for (i = 0; i < N; i++) {
		for (j = 0; j < N; j++)
			printf("%d ", b[i][j]);
		printf("\n");
	}


	int k = 0;
	for (int i = 0; i < N; i++)
		for (int j = 0; j < N; j++)
			for (int k = 0; k < N; k++)
				result[i][j] += a[i][k] * b[k][j];




	printf("\nResult:\n");
	for (i = 0; i < N; i++) {
		for (j = 0; j < N; j++)
			printf("%d ", result[i][j]);
		printf("\n");
	}




	return 0;
}