时间类
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#include <iostream> #include <string> using namespace std; class Time{ public: Time(int=0,int=0,int=0); 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 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; }; //下面写出静态成员的初始化及各成员函数的定义…… bool Time::is_24=true; bool Time::from0=false; Time::Time(int h,int m,int s): hour(h), minute(m), sec(s){} int main() //运行结果如图所示 { Time t1(23,14,25),t2(8,45,6); cout<<"24时制, 不前导0:"<<endl; cout<<" t1是:"; t1.show_time(); cout<<" t2是:"; t2.show_time(); t1.add_hours(10); t2.add_hours(10); cout<<"10小时后, 切换是 t2.show_time(); t1.change24(); cout<<"换一种制式:"<<endl; cout<<" t1是:"; t1.show_time(); cout<<" t2是:"; t2.show_time(); system("pause"); return 0; void Time::show_time( ) { int h=(is_24)?hour:hour%12; if (h<10 && from0) cout<<'0'; cout<<h<<':'; if(minute<10 && from0) cout<<'0'; cout<<minute<<':'; //输出 秒 if(sec<10&&from0) cout<<'0'; cout<<sec; if(is_24==false) if (hour>12) cout<<" pm"; else cout<<" am"; cout<<endl; } void Time::add_seconds } { minute+=n; if(min93. minute%=60; } .void Time::add_hours(int n) 9{ hour+=n; if(hour>23){ hour%=24; } { is_24=!is_24; } void Time::changefrom0() { from0=!from0; }