struct TIME
{
int seconds;
int minutes;
int hours;
};
void differenceBetweenTimePeriod(struct TIME t1, struct TIME t2, struct TIME *diff);

int main()
{
struct TIME startTime, stopTime, diff;

printf("输入开始时间: \n");
printf("输入小时、分钟、秒：");
scanf("%d %d %d", &startTime.hours, &startTime.minutes, &startTime.seconds);

printf("输入停止时间: \n");
printf("输入小时、分钟、秒: ");
scanf("%d %d %d", &stopTime.hours, &stopTime.minutes, &stopTime.seconds);

// 计算差值
differenceBetweenTimePeriod(startTime, stopTime, &diff);

printf("\n差值: %d:%d:%d – ", startTime.hours, startTime.minutes, startTime.seconds);
printf("%d:%d:%d ", stopTime.hours, stopTime.minutes, stopTime.seconds);
printf("= %d:%d:%d\n", diff.hours, diff.minutes, diff.seconds);

return 0;
}

void differenceBetweenTimePeriod(struct TIME start, struct TIME stop, struct TIME *diff)
{
if(stop.seconds > start.seconds){
—start.minutes;
start.seconds += 60;
}

diff->seconds = start.seconds – stop.seconds;
if(stop.minutes > start.minutes){
—start.hours;
start.minutes += 60;
}

diff->minutes = start.minutes – stop.minutes;
diff->hours = start.hours – stop.hours;
}