（14）求两个矩阵之和、之积

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define M 2
#define N 2
int main(){
	int a[M][N] = { 0 }, b[M][N] = { 0 }; //定义两个矩阵a和b
	int sum[M][N] = { 0 };                //矩阵sum保存矩阵a和b的和
	int product[M][N] = { 0 };            //矩阵product保存矩阵a和b的积
	printf("请输入第一个矩阵：\n");
	for (int i = 0; i < M; i++) {
		for (int j = 0; j < N; j++) {
			scanf("%d", &a[i][j]);
		}
	}
	printf("请输入第二个矩阵：\n");
	for (int i = 0; i < M; i++) {
		for (int j = 0; j < N; j++) {
			scanf("%d", &b[i][j]);
		}
	}
	//计算矩阵a与矩阵b的和
	for (int i = 0; i < M; i++) {
		for (int j = 0; j < N; j++) {
			sum[i][j] = a[i][j] + b[i][j];
		}
	}
	//计算矩阵a与矩阵b的积
	for (int i = 0; i < M; i++) {
		for (int j = 0; j < N; j++) {
			int temp = 0;
			for (int k = 0; k < N; k++) {
				temp += a[i][k] * b[k][j];
			}
			product[i][j] = temp;
		}
	}
	//输出矩阵a与矩阵b的和
	printf("矩阵之和：\n");
	for (int i = 0; i < M; i++) {
		for (int j = 0; j < N; j++) {
			printf("%d ", sum[i][j]);
		}
		printf("\n");
	}
	//输出矩阵a与矩阵b的积
	printf("矩阵之积：\n");
	for (int i = 0; i < M; i++) {
		for (int j = 0; j < N; j++) {
			printf("%d ", product[i][j]);
		}
		printf("\n");
	}
	return 0;
}