时间类模拟闹钟，请教，谢谢，问题见程序注释

#include<iostream>
using namespace std;
class clock
{
      public:
      clock(int h,int m,int s);
      void setalarm(int h,int m,int s);
      void showtime();
      void run();
      private:
      int hours, minutes, seconds;
      int ahours, aminutes, aseconds;
};
clock::clock(int h,int m,int s)
{
    seconds=(s>59?0:s);
    minutes=(m>59?0:m);
    hours=(h>23?0:h);
}
void clock::setalarm(int h,int m,int s)
{
     ahours=(h>23?0:h);
     aminutes=(m>59?0:m);
     aseconds=(s>59?0:s);
}
void clock::showtime()
{
     cout<<"now:"<<hours<<":"<<minutes<<":"<<seconds<<endl;
}
void clock::run()
{
     seconds=seconds+1;
     if(seconds>59)
     {
         seconds=0;
         minutes+=1;
     }
     if(minutes>59)
     {
         minutes=0;
         hours+=1;
     }
     if(hours>24)
     hours=0;
     if(hours==ahours&&minutes==aminutes&&seconds==aseconds)
     {
         cout<<"!pink...."<<endl;
         cout<<"时间到了"<<'\a'<<endl;
         
     }
}
int main()
{
    clock c(7,59,57);
    c.showtime();
    c.setalarm(8,0,0);
    for(int i=0;i<3600*24*3+100;i++)                       //为什么是3600*24*3+100，求解释
    c.run();
    c.showtime();                                      程序输出结果为什么是5：1：37
    system("pause");
    return 0;
}