Time conversion ()

This question requires the preparation of procedures , With hh:mm:ss Output in the format of... After a given time n Time value after seconds （ exceed 23:59:59 From 0 The clock starts at ）.

Input format ：

Enter in the first line with hh:mm:ss The format of gives the start time , The second line gives the number of whole seconds n（<60）.

Output format ：

The output is given on one line hh:mm:ss Result time in format .

sample input ：

11:59:40
30

sample output ：

12:00:10

Code ：

#include <stdio.h>
int main(){
    int h,m,s;
    scanf("%d:%d:%d",&h,&m,&s);
    int n;
    scanf("%d",&n);
    n=n+s;
    if(n>=60){
        n=n%60;
        m++;
        if(m>=60){
            m=m%60;
            h++;
        }
    }
    if(h==24)h=h-24;
    printf("%02d:%02d:%02d",h,m,n);
}