原文： https://www.programiz.com/c-programming/examples/time-structure

在此示例中，您将学习使用用户定义的函数计算两个时间段之间的差。

要理解此示例，您应该了解以下 C 编程主题：

计算两个时间段之间的差异

  1. #include <stdio.h>
  2. struct TIME {
  3.    int seconds;
  4.    int minutes;
  5.    int hours;
  6. };
  8. void differenceBetweenTimePeriod(struct TIME t1,
  9.                                  struct TIME t2,
  10.                                  struct TIME *diff);
  12. int main() {
  13.    struct TIME startTime, stopTime, diff;
  15.    printf("Enter the start time. \n");
  16.    printf("Enter hours, minutes and seconds: ");
  17.    scanf("%d %d %d", &startTime.hours,
  18.          &startTime.minutes,
  19.          &startTime.seconds);
  21.    printf("Enter the stop time. \n");
  22.    printf("Enter hours, minutes and seconds: ");
  23.    scanf("%d %d %d", &stopTime.hours,
  24.          &stopTime.minutes,
  25.          &stopTime.seconds);
  27.    // Difference between start and stop time
  28.    differenceBetweenTimePeriod(startTime, stopTime, &diff);
  29.    printf("\nTime Difference: %d:%d:%d - ", startTime.hours,
  30.           startTime.minutes,
  31.           startTime.seconds);
  32.    printf("%d:%d:%d ", stopTime.hours,
  33.           stopTime.minutes,
  34.           stopTime.seconds);
  35.    printf("= %d:%d:%d\n", diff.hours,
  36.           diff.minutes,
  37.           diff.seconds);
  38.    return 0;
  39. }
  41. // Computes difference between time periods
  42. void differenceBetweenTimePeriod(struct TIME start,
  43.                                  struct TIME stop,
  44.                                  struct TIME *diff) {
  45.    while (stop.seconds > start.seconds) {
  46.       --start.minutes;
  47.       start.seconds += 60;
  48.    }
  49.    diff->seconds = start.seconds - stop.seconds;
  50.    while (stop.minutes > start.minutes) {
  51.       --start.hours;
  52.       start.minutes += 60;
  53.    }
  54.    diff->minutes = start.minutes - stop.minutes;
  55.    diff->hours = start.hours - stop.hours;
  56. }

输出

  1. Enter the start time.
  2. Enter hours, minutes and seconds: 12
  3. 34
  4. 55
  5. Enter the stop time.
  6. Enter hours, minutes and seconds: 8
  7. 12
  8. 15
  10. Time Difference: 12:34:55 - 8:12:15 = 4:22:40

在该程序中，要求用户输入两个时间段，这两个时间段分别存储在结构变量startTime和stopTime中。

然后，函数differenceBetweenTimePeriod()计算时间段之间的差。 结果从main()函数显示而不返回（使用按引用调用技术）。