编辑代码

#include <stdio.h>
#define SEC_MIN 60

int main()
{
    int sec, min, left, hour;
    scanf("%d", &sec);
    
    while (sec > 0)
    {
        left = sec % SEC_MIN;
        min = sec / SEC_MIN;
        hour = min / SEC_MIN;
        min = min % SEC_MIN;
        printf("%02d:%02d:%02d\n", hour, min, left);
        scanf("%d", &sec);
    }

    return 0;
}