用C语言循环语句写，我不会，帮我看看吧，

#include <stdio.h>

int main()
{
   int h,m,s;
    scanf("%d:%d:%d",&h,&m,&s);
    int d = 0;
    s+=1;
    d=s/60;
    s%=60;
    m+=d;
    d=m/60;
    m%=60;
    h+=d;
    h%=24;
   printf("%02d:%02d:%02d", h, m, s);
   return 0;
}