問題4回答
#include<stdio.h>
main()
{
int a[4][4] = {{3, 6, 2, 5},
{8, 5, 4, 5},
{7, 7, 9, 4},
{4, 5, 3, 1}};
int x, y;
for(x = 0; x < 4; x++){
for(y = 0; y< 4; y++){
a[x][y] = a[x][y] - 2;
printf("%.0f ", a[x][y]);
}printf("\n");
}
}