#include <stdio.h>
 
int ans[2][2];
void array_mul(int (*x)[2],int (*y)[2],int (*ans)[2])
{
	for(int i=0;i<2;i++) //行
	{
		for(int j=0;j<2;j++) //列
		{
			for(int d=0;d<2;d++)
			{
				ans[i][j] += x[i][d] * y[d][j];
			}
		}
	}
 
 
}
 
 
int main(void) {
	int x[2][2] = { {1,2},
					{3,4} };
	int y[2][2] = { {1,2},
					{3,4} };
	array_mul(x,y,ans);
	for(int k=0;k<2;k++)
	{
		for(int f=0;f<2;f++)
		{
			printf("%d",ans[k][f]);
		}
		printf("\n");
	}
	return 0;
}
 

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