P17-2-2-1-variable.c

#include<stdio.h>
int main() // why int?
{
    int hour1, minute1;
    int hour2, minute2;
    scanf("%d %d", &hour1, &minute1);
    scanf("%d %d", &hour2, &minute2);
    int t1=hour1*60+minute1;
    int t2=hour2*60+minute2;
    int t = t2-t1;
    printf("時間差是%d小時%d分。", t/60, t%60);
return 0;
}