如何循环显示每 15 分钟的时间？

Question

我的作业要求我显示用户输入的开始时间 (hh:mm:ss) 和行驶距离。出租车以 90 公里/小时的速度行驶。所以理想情况下，我希望程序显示时间（间隔 15 分钟），从开始时间到结束时间，但格式为 mm:ss。

我的做法是把开始时间和结束时间转换成秒，用for循环。我的间隔是 i+900（15 分钟秒）。但是，我的 for 循环保持运行并且永不结束。谁能帮帮我？

enter image description here <--- 预期输出

我当前的代码

    int hour, min, sec, minhour, newmin, timesec, endtime; //ignore irrelevant variables
    float distance, remdis, remdisb, firstfare, secondfare, fare;

    printf("Input your starting travelling time in 24hrs clock (hh mm ss): ");
    scanf("%d %d %d", &hour, &min, &sec);
    printf("Input your total travelling distance (km): ");
    scanf("%f", &distance);
    minhour = hour * 60;
    newmin = min + minhour;
    printf("Your starting time is %02d:%02d:%02d or %02d:%02d (mm:ss)\n", hour, min, sec, newmin, sec);
    printf("Your total travelling distance is %.1fkm or %.0fm\n", distance, distance*1000);

    timesec = hour*3600 + min*60 + sec;
    endtime = timesec + ((distance/90)*3600);

    printf("Starting time | Fare(%.1fkm)", distance);

    for (int i=timesec; i<=endtime; i+900)
    {
        min = i/60;
        sec = i - min;
        printf("%d:%d   |  $XX.yy\n", min, sec);
    }

Answer 1

试试这个：

    int hour, min, sec, minhour, newmin, timesec, endtime; //ignore irrelevant variables
    float distance, remdis, remdisb, firstfare, secondfare, fare;

    printf("Input your starting travelling time in 24hrs clock (hh mm ss): ");
    scanf("%d %d %d", &hour, &min, &sec);
    printf("Input your total travelling distance (km): ");
    scanf("%f", &distance);
    minhour = hour * 60;
    newmin = min + minhour;
    printf("Your starting time is %02d:%02d:%02d or %02d:%02d (mm:ss)\n", hour, min, sec, newmin, sec);
    printf("Your total travelling distance is %.1fkm or %.0fm\n", distance, distance*1000);

    endtime = newmin + ((distance*60)/90);

    printf("Starting time | Fare(%.1fkm)\n", distance);

    for (int i=newmin; i<=endtime; i+=15)
    {
        hour = i/60;
        min = i % 60;
        printf("%02d:%02d   |  $XX.yy\n", hour, min);
    }

Answer 2

However, my for loop keeps running and never ends
     for (int i=timesec; i<=endtime; i+900)
                                     ~~~~~~

在这里使用i+=900，而不是i+900。

如何循环显示每 15 分钟的时间？

how to display time every 15mins with a loop?

c

time

for-loop