//結構體#include<stdio.h>struct time //聲明一個結構體類型{int h;//hourint m;//mintus int s;//scends}add;intmain(){int n;scanf("%d:%d:%d",&add.h,&add.m,&add.s);//輸入時間scanf("%d",&n);//輸入秒數add.s=add.s+n;//秒數相加if(add.s>=60)//若秒數大于等于60,則需在分鐘數+1,秒數-60{ add.s=add.s-60;add.m++;}if(add.m>=60)//原理同秒數{add.m=add.m-60;add.h++;}if(add.h>=24)//原理同秒數add.h=add.h-24;printf("%02d:%02d:%02d",add.h,add.m,add.s);//輸出return0;}