第二周实验报告2

 #include <iostream> using namespace std; class Time {public:   void set_time( );      void show_time( );   void add_n_sec(int );  void add_n_minute(int );  void add_n_hour(int );  void add_a_sec( );  void add_a_minute( );  void add_a_hour( );private:    bool is_time(int, int, int);   int hour;   int minute;     int sec; }; int main( ) { int s,m,h;Time t1;   Time &t2=t1; t1.set_time( );    t2.show_time( );cout<<"输入加的秒：";cin>>s;t1.add_n_sec(s);t1.show_time( );    cout<<"输入加的分钟：";    cin>>m;    t1.add_n_minute (m);    t1.show_time( );cout<<"输入加的小时：";cin>>h;t1.add_n_hour( h);t1.show_time( );    t1.add_a_sec();cout<<"加入一秒的结果：";t1.show_time( );t1.add_a_minute ();cout<<"加入一分的结果：";    t1.show_time( );    t1.add_a_hour( );cout<<"加入一小时的结果：";t1.show_time( );return 0; } void Time::set_time( )  {  char c1,c2;   cout<<"请输入时间(格式 hh:mm:ss)";   while(1)   {  cin>>hour>>c1>>minute>>c2>>sec;    if(c1!=':'||c2!=':')     cout<<"格式不正确，请重新输入"<<endl;    else if (!is_time(hour,minute,sec))     cout<<"时间非法，请重新输入"<<endl;    else      break;   } } void Time::show_time( )       {  cout<<hour<<":"<<minute<<":"<<sec<<endl; } bool Time::is_time(int h,int m, int s) {  if (h<0 ||h>24 || m<0 ||m>60 || s<0 ||s>60)    return false;   return true; } void Time::add_n_sec(int n){ int h,m,s; s =(sec +n)%60; m=(sec +n)/60+minute ; minute =m%60; h=m/60+ hour ; hour =h%24; sec=s;}void Time::add_n_minute(int n){ int h; minute=(minute+n)%60; h=hour+(minute+n)/60; hour=h%24;}void Time::add_n_hour(int n){ hour=(hour+n)%24;}void Time::add_a_sec(){ int h,m,s; s =(sec +1)%60; m=(sec +1)/60+minute ; minute =m%60; h=m/60+ hour ; hour =h%24; sec=s;}void Time::add_a_minute(){ int h; minute=(minute+1)%60; h=hour+(minute+1)/60; hour=h%24;}void Time::add_a_hour(){ hour=(hour+1)%24;}