静态成员应用

来源：互联网发布：宁波网络继续教育编辑：程序博客网时间：2024/06/10 04:17
#include <iostream>#include <cstdio>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时制之间转换    static void changefrom0();   //改变静态成员from0，切换是否前导0private:    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;};bool Time::is_24=true;bool Time::from0=true;Time::Time(int h,int m,int s){    hour=h;    minute=m;    sec=s;}void Time::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{    if(is_24)    {        if(from0)            printf("%02d:%02d:%02d\n",hour,minute,sec);        else            cout<<hour<<":"<<minute<<":"<<sec<<endl;    }    else    {        if(hour>12&&hour<=24)        {            hour-=12;            if(from0)                printf("%02d:%02d:%02d pm\n",hour,minute,sec);            else                cout<<hour<<":"<<minute<<":"<<sec<<" pm"<<endl;        }        else        {            if(from0)                printf("%02d:%02d:%02d am\n",hour,minute,sec);            else                cout<<hour<<":"<<minute<<":"<<sec<<" am"<<endl;        }    }}void Time::add_seconds(int n) //增加n秒钟{    sec+=n;    if (sec>59)    {        add_minutes(sec/60);//增加sec/60分钟        sec%=60;//秒数应该是sec%=60    }}void Time::add_minutes(int n) //增加n分钟{    minute+=n;    if (minute>59)    {        add_hours(minute/60);        minute%=60;    }}void Time::add_hours(int n)//增加n小时{    hour+=n;    if (hour>23)        hour%=24;}void Time::change24()  //改变静态成员is_24，在12和24时制之间转换{    is_24=!is_24;}void Time::changefrom0()  //改变静态成员from0，切换是否前导0{    from0=!from0;}int main(){    Time t1(19,49,43),t2(8,20,6);    cout<<"t1的时间为：";    t1.show_time( );    t1.add_seconds(99); //增加n秒钟    cout<<"增加99秒后：";    t1.show_time( );    t1.add_minutes(66); //增加n分钟    cout<<"增加66分后：";    t1.show_time( );    t1.add_hours(3); //增加n小时    cout<<"增加3时后：";    t1.show_time( );    t1.change24();    cout<<"改变时制后：";    t1.show_time( );    t1.changefrom0();    cout<<"前导0后：";    t1.show_time( );    cout<<"t2的时间为：";    t2.show_time( );    t2.add_seconds(33); //增加n秒钟    cout<<"增加33秒后：";    t2.show_time( );    t2.add_minutes(22); //增加n分钟    cout<<"增加22分后：";    t2.show_time( );    t2.add_hours(11); //增加n小时    cout<<"增加11时后：";    t2.show_time( );    t2.change24();    cout<<"改变时制后：";    t2.show_time( );    t2.changefrom0();    cout<<"前导0后：";    t2.show_time( );    return 0;}
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