第七周实验报告一
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#include <iostream> 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) //在定义函数时可以不再指定参数的默认值 { hour=h; minute=m; sec=s; } bool Time::is_24=true; bool Time::from0=false; int main( ) { 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); Time::changefrom0(); //注意此处调用静态成员 cout<<"10小时后, 切换是否前导0:"<<endl; cout<<"t1是:"; t1.show_time(); cout<<"t2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; } //下面写出静态成员的初始化及各成员函数的定义 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(Time::is_24!=true && Time::from0!=true) { if(hour>12) { hour=hour%12; cout<<hour<<":"<<minute<<":"<<sec<<" pm"<<endl; } else { cout<<hour<<":"<<minute<<":"<<sec<<endl; } } if(Time::is_24==true && Time::from0==true) { int h[2]={48,hour},m[2]={48,minute},s[2]={48,sec}; if(hour>=10) { h[0]='\0'; } if(minute>=10) { m[0]='\0'; } if(sec>=10) { s[0]='\0'; } cout<<(char)h[0]<<h[1]<<":"<<(char)m[0]<<m[1]<<":"<<(char)s[0]<<s[1]<<endl; } if(Time::is_24!=true && Time::from0==true) { int h[2]={48,hour},m[2]={48,minute},s[2]={48,sec}; if(hour>12) { hour=hour%12; h[1]=hour; if(hour>=10) { h[0]='\0'; } if(minute>=10) { m[0]='\0'; } if(sec>=10) { s[0]='\0'; } cout<<(char)h[0]<<h[1]<<":"<<(char)m[0]<<m[1]<<":"<<(char)s[0]<<s[1]<<" pm"<<endl; } else { if(hour>=10) { h[0]='\0'; } if(minute>=10) { m[0]='\0'; } if(sec>=10) { s[0]='\0'; } cout<<(char)h[0]<<h[1]<<":"<<(char)m[0]<<m[1]<<":"<<(char)s[0]<<s[1]<<" am"<<endl; } } if(Time::is_24==true && Time::from0!=true) { cout<<hour<<":"<<minute<<":"<<sec<<endl; } } void Time::add_hours(int h) //增加n小时 { hour+=h; if (hour>23) hour%=24; } void Time::changefrom0() //改变静态成员from0,切换是否前导0 { from0=true; } void Time::change24() //改变静态成员is_24,在12和24时制之间转换 { is_24=false; } void Time::add_seconds(int s) //增加n秒钟 { sec+=s; 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 m) //增加n分钟 { minute+=m; if (minute>59) { add_hours(minute/60); minute%=60; } }