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

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