C++第三次作业-2

来源：互联网发布：c语言比较字符串长度编辑：程序博客网时间：2024/06/03 17:03
#include<iostream>  using namespace std;  class Time{    public:        Time(int h,int m,int s);        void show_time( ); //根据is_24和from0，输出适合形式-20:23:5/8:23:5 pm/08:23:05 pm        void add_seconds(int); //增加n秒钟        void add_minutes(int); //增加n分钟          void add_hours(int); //增加n小时          static void change24();  //改变静态成员is_24，在12和24时制之间转换        static void changefrom0();   //改变静态成员from0，切换是否前导0     private:        static bool is_24; //为true时，24小时制，如20:23:5；为flase，12小时制，显示为8:23:5 pm         static bool from0; //为true时，前导0，8:23:5显示为08:23:05        int hour;        int minute;        int sec;    };      Time::Time(int h,int m,int s)  {      hour=h;minute=m;sec=s;  }    bool Time::is_24=true;  void Time::change24()  {      is_24=false;  }    bool Time::from0=false;  void Time::changefrom0()  {      from0=true;  }    void Time::show_time()  {      if(is_24&&(!from0))          cout<<hour<<":"<<minute<<":"<<sec<<endl;      else if(is_24&&from0)      {          if(hour<10)              cout<<"0"<<hour<<":";          else cout<<hour<<":";          if(minute<10)              cout<<"0"<<minute<<":";          else cout<<minute<<":";          if(sec<10)              cout<<"0"<<sec;          else cout<<sec;          cout<<endl;      }      else if((!is_24)&&from0)      {          int k=0;          if(hour>=12)          {              hour-=12;              k++;          }          if(hour<10)              cout<<"0"<<hour<<":";          else cout<<hour<<":";          if(minute<10)              cout<<"0"<<minute<<":";          else cout<<minute<<":";          if(sec<10)              cout<<"0"<<sec;          else               cout<<sec;          if(k!=0)              cout<<" "<<"pm";          else              cout<<" "<<"am";          cout<<endl;      }  }    void Time::add_seconds(int n)//增加n秒  {      int t;      sec+=n;      if(sec>=60)      {          t=sec/60;          add_minutes(t);          sec%=60;      }  }    void Time::add_minutes(int n) //增加n分钟  {      int t;      minute+=n;      if(minute>=60)      {          t=minute/60;          add_hours(t);          minute%=60;      }  }    void Time::add_hours(int n) //增加n小时  {      hour+=n;      if(hour>=24)hour-=24;  }  //下面写出静态成员的初始化及各成员函数的定义……    int main( )     {       cout<<"24小时制，不前导："<<endl;      Time t1(23,14,25);      Time t2(8,45,6);      cout<<"t1是：";      t1.show_time();      cout<<"t2是：";      t2.show_time();        cout<<"10小时后，切换是否前导："<<endl;          t1.add_hours(10);         t2.add_hours(10);        cout<<"t1是：";      t1.changefrom0();      t1.show_time();        cout<<"t2是：";      t1.changefrom0();      t2.show_time();        cout<<"换一种制式："<<endl;      t1.change24();      t2.change24();      cout<<"t1是：";      t1.show_time();      cout<<"t2是：";      t2.show_time();      return 0;  }
0 0