c语言时间练习帮助我一下

42. 输入一个时间，输出它的下一秒时间。比如输入12:30:59秒下一秒是

12:31:00。

让秒自增，然后依次判断秒、分、时是否进位

#include <stdio.h>
int main(int argc, char const *argv[])
{
    int hour,minute,second;
    scanf("%d:%d:%d",&hour,&minute,&second);
    second++;
    if (second == 60) {
        second = 0;
        minute++;
    }
    if (minute == 60) {
        minute = 0;
        hour ++;
    }
    if (hour == 24) {
        hour = 0;
    }
    printf("%02d:%02d:%02d",hour,minute,second);
}

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

int main(void){
    int n, m, d;

    scanf("%d %d %d", &n,&m,&d);

    d += 1;
    if(d == 60){
        d = 0;
        m += 1;
    }

    if(m == 60){
        m = 0;
        n += 1;
    }

    if(n == 24){
        n = 0;
    }

    printf("%0.2d:%0.2d:%0.2d\n", n, m, d);

    system("pause");
    return 0;
}