第七周 1-1

1. /* (程序头部注释开始) 
2. * 程序的版权和版本声明部分 
3. * Copyright (c) 2011, 烟台大学计算机学院学生  
4. * All rights reserved. 
5. * 文件名称：                               
6. * 作    者：   张启立                           
7. * 完成日期：   2012      年   3    月    28    日 
8. * 版 本 号：           
9.  
10. * 对任务及求解方法的描述部分 
11. * 输入描述：    
12. * 程序输出：  
13. * 程序头部的注释结束 
14. */  

15. #include<iostream>#include<iomanip>using namespace std;class Time{public:Time(int h = 0, int m = 0, int s = 0):hour(h), minute(m), sec(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 pmvoid 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08:23:05int hour;int minute;int sec;};bool Time::is_24 = true;bool Time::from0 = false;void Time::show_time(){if(is_24 == true){if(from0 == true){cout << setfill('0') << setw(2) << hour << ":" << setfill('0') << setw(2) << minute << ":" << setfill('0') << setw(2) << sec << endl;}else{cout << hour << ":" << minute << ":" << sec << endl;}}else{char c = 'a';if(hour > 12){hour  -= 12;c= 'p';}if(from0 == true){cout << setfill('0') << setw(2) << hour << ":" << setfill('0') << setw(2) << minute << ":" << setfill('0') << setw(2) << sec << " " << c << "m" << endl;}else{cout << hour << ":" << minute << ":" << sec << " " << c << "m" << endl;}}}void Time::change24(){is_24 = (!is_24);}void Time::changefrom0(){from0 = (!from0);}void Time::add_seconds(int n)    {           sec = sec + n;        if(sec >= 60)        {            add_minutes(sec/60);          sec = sec % 60;      }    }    void Time::add_minutes(int n)    {           minute = minute + n;        if(minute >= 60)        {           add_hours(minute / 60);          minute =  minute % 60;        }   }  void Time::add_hours(int n)    {        hour = hour + n;        if(hour >= 24)        {           hour = hour % 24;        }   }    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;}