时间换算：用结构类型表示时间内容(时间以时、分、秒表示)，输

#include<stdio.h>

typedef struct time{
    int hours;
    int minutes;
    int seconds;
}Time;      //定义表示时间的结构体 time，并使用别名 Time来代替 struct time 去定义结构体变量

Time time_update(Time now,int n);

int main(void){
    Time t = {0,0,0};   // 定义一个时间类型的结构体变量并初始化
    int n;

    printf("input time(h m s):");
    scanf("%d %d %d",&t.hours,&t.minutes,&t.seconds);
    printf("input n:");
    scanf("%d",&n);

    t = time_update(t,n);

    printf("n seconds later,it's %d:%d:%d\n",t.hours,t.minutes,t.seconds);

    return 0;
}

/** now为当前时间，经过n秒后，返回时间 */
Time time_update(Time now,int n){
    now.seconds += n;

    /**存在进位的数据，要从最低位逐步往高位进位*/
    if(now.seconds >= 60){  //若当前时间过了n秒后，进入下一分钟
        now.seconds -= 60; /**当前时间经过n秒后可能会导致进位后还有余数，
        比如1分58秒的3秒后为2分1秒，所以需要将过了n秒的秒数now.seconds减去60 */
        now.minutes++;

        if(now.minutes == 60){  //由于秒的进位导致分钟也需要进位
            now.minutes = 0;
            now.hours++;

            if(now.hours == 24)
                now.hours = 0;
        }
    }

    return now;
}

/*时间换算*/
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
struct time
{     int hour;     int minute;     int second;

}time1;
int main(void)
{     int s;     printf("Enter a time:");     scanf("%d%d%d", &time1.hour, &time1.minute, &time1.second);     printf("Enter a s:");     scanf("%d", &s);     time1.second += s;     if (time1.second >=60) {         time1.minute+=time1.second/60;         time1.second = time1.second % 60;     }     if (time1.minute>=60) {         time1.hour += time1.minute / 60;         time1.minute = time1.minute % 60;     }     if (time1.hour >= 24) {         time1.hour = time1.hour/24;         time1.hour = time1.hour % 24;     }     printf("%d:%d:%d", time1.hour, time1.minute, time1.second);     return 0;
}