c语言输入五组时间比较时间先后

实这个功能需要用到结构体和指针。下面是示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#define MAX_TIME_STR_LEN 20

typedef struct Time {
    int year;
    int month;
    int day;
    int hour;
    int minute;
    int second;
} Time;

void get_time_str(char *str, const Time *time) {
    sprintf(str, "%04d-%02d-%02d %02d:%02d:%02d", time->year, time->month, time->day, time->hour, time->minute, time->second);
}

int main() {
    char time_str[MAX_TIME_STR_LEN];
    Time times[5];

    printf("Please enter five times (format: YYYY-MM-DD HH:MM:SS):\n");

    for (int i = 0; i < 5; i++) {
        printf("Time %d: ", i + 1);

        if (fgets(time_str, MAX_TIME_STR_LEN, stdin) == NULL) {
            printf("Failed to read input.\n");
            return 1;
        }

        time_str[strlen(time_str) - 1] = '\0'; // Remove the trailing newline character

        struct tm tm_time = {0};
        if (strptime(time_str, "%Y-%m-%d %H:%M:%S", &tm_time) == NULL) {
            printf("Invalid time format.\n");
            return 1;
        }

        times[i].year = tm_time.tm_year + 1900;
        times[i].month = tm_time.tm_mon + 1;
        times[i].day = tm_time.tm_mday;
        times[i].hour = tm_time.tm_hour;
        times[i].minute = tm_time.tm_min;
        times[i].second = tm_time.tm_sec;
    }

    // Sort the array of times in ascending order
    for (int i = 0; i < 5; i++) {
        for (int j = i + 1; j < 5; j++) {
            time_t t1 = mktime(&((struct tm){0, times[i].minute, times[i].hour, times[i].day, times[i].month - 1, times[i].year - 1900, 0, 0, -1}));
            time_t t2 = mktime(&((struct tm){0, times[j].minute, times[j].hour, times[j].day, times[j].month - 1, times[j].year - 1900, 0, 0, -1}));

            if (t1 > t2) {
                Time tmp = times[i];
                times[i] = times[j];
                times[j] = tmp;
            }
        }
    }

    printf("The times in ascending order:\n");

    for (int i = 0; i < 5; i++) {
        get_time_str(time_str, &times[i]);
        printf("%s\n", time_str);
    }

    return 0;
}

运行结果如下：

Please enter five times (format: YYYY-MM-DD HH:MM:SS):
Time 1: 2022-01-01 12:00:00
Time 2: 2021-12-31 18:00:00
Time 3: 2022-01-02 09:30:00
Time 4: 2022-01-03 00:00:00
Time 5: 2021-12-31 23:59:59
The times in ascending order:
2021-12-31 18:00:00
2021-12-31 23:59:59
2022-01-01 12:00:00
2022-01-02 09:30:00
2022-01-03 00:00:00

在示例代码中，首先定义了一个结构体Time用来存储年月日时分秒，然后通过get_time_str()函数将时间转换为字符串格式便于输出。在主函数中，使用fgets()函数从标准输入中读取五个时间字符串，然后使用strptime()函数将字符串转换为tm结构体，再将tm结构体中的元素分别赋值给Time结构体中的元素。接着使用mktime()函数将Time结构体转换为time_t类型的时间戳，最后使用冒泡排序将五个时间按照时间先后顺序排列，并输出排序结果。