C语言实现两个矩阵相乘

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#define ROW 3
#define COL 3
#define MID 4
int main()
{
int arr1[ROW][MID] = { 0 };
int arr2[MID][COL] = { 0 };
int arr3[ROW][COL] = { 0 };
int i = 0;
int j = 0;
int m = 0;
printf("第一个矩阵\n" );
for (i = 0; i < ROW; i++)
{
printf("第一个矩阵的%d行\n", i);
for (j = 0; j < MID; j++)
{
scanf("%d", &arr1[i][j]);
}
}
printf("第二个矩阵\n");
for (i = 0; i < MID; i++)
{
printf("第二个矩阵第%d行\n", i);
for (j = 0; j < COL; j++)
{
scanf("%d", &arr2[i][j]);
}
}
printf("第三个矩阵:\n");
for (i = 0; i < ROW; i++)
{
for (j = 0; j < COL; j++)
{
int sum = 0;
for (m = 0; m < MID; m++)
{
sum = sum + arr1[i][m] * arr2[m][j];
}
arr3[i][j] = sum;
}
}
for (i = 0; i < ROW; i++)
{
for (j = 0; j < COL; j++)
{
printf("%3d", arr3[i][j]);
}
printf("\n");
}
system("pause");
return 0;
}