第九周任务二：CTime类的扩展

* (程序头部注释开始)
 * 程序的版权和版本声明部分
 * Copyright (c) 2011, 烟台大学计算机学院学生
 * All rights reserved.
 * 文件名称：
 * 作者：吴瑕
 * 完成日期： 2012年 04月16日
 * 版本号：
 *对任务及求解方法的描述部分
 * 输入描述：定义Time类中的<<和>>运算符重载，实现时间的输入输出，改造原程序中对运算结果显示方式，使程序读起来更自然。

#include <iostream>using namespace std;class CTime{private:unsigned short int hour;    // 时unsigned short int minute;  // 分unsigned short int second;  // 秒public:CTime(int h=0,int m=0,int s=0):hour(h),minute(m),second(s){}void setTime(int h,int m,int s);//比较运算符(二目)的重载bool operator > (CTime &t);bool operator < (CTime &t);bool operator >= (CTime &t);bool operator <= (CTime &t);bool operator == (CTime &t);bool operator != (CTime &t);//二目运算符的重载CTime operator+(CTime &c);//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15CTime operator-(CTime &c);//对照+理解CTime operator+(int s);//返回s秒后的时间CTime operator-(int s);//返回s秒前的时间//一目运算符的重载CTime operator++(int);//后置++，下一秒CTime operator++();//前置++，下一秒CTime operator--(int);//后置--，前一秒CTime operator--();//前置--，前一秒//赋值运算符的重载     CTime operator+=(CTime &c);CTime operator-=(CTime &c);CTime operator+=(int s);//返回s秒后的时间CTime operator-=(int s);//返回s秒前的时间//运算符<<和>>的重载为友元函数friend istream &operator >> (istream&,CTime&);    friend ostream &operator << (ostream&,CTime&);};//下面实现所有的运算符重载代码。//为简化编程，请注意通过调用已有函数，利用好各函数之间的关系void CTime::setTime(int h,int m,int s){  hour=h;  minute=m;  second=s;  }//比较运算符(二目)的重载bool CTime::operator > (CTime &t){if(hour>t.hour){return true;}else {if(hour==t.hour){if(minute>t.minute){return true;}else {if(minute==t.minute){if(second>t.second){return true;}else {return false;}}else {return false;}}}}}bool CTime::operator < (CTime &t){if(hour<t.hour){return true;}else {if(hour==t.hour){if(minute<t.minute){return true;}else {if(minute==t.minute){if(second<t.second){return true;}else {return false;}}else {return false;}}} }}bool CTime::operator >= (CTime &t){if(*this<t){return false;}else{return true;}}bool CTime::operator <= (CTime &t){if(*this>t){return false;}else{return true;}}bool CTime::operator == (CTime &t){if(hour==t.hour&&minute==t.minute&&second==t.second){return true;}else{return false;}}bool CTime::operator != (CTime &t){if(*this==t){return false;}else{return true;}}//二目运算符的重载CTime  CTime::operator+(CTime &c)//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15{CTime  c1;c1.second=second+c.second;c1.minute=minute+c.minute;c1.hour=hour+c.hour;if(c1.second>60){c1.minute=c1.minute+c1.second/60;c1.second=c1.second%60;}if(c1.minute>60){c1.hour=c1.hour+c1.minute/60;c1.minute=c1.minute%60;}if(c1.hour>24){c1.hour=c1.hour%24;}return c1;}CTime  CTime::operator-(CTime &c)//对照+理解{CTime  c1;if(second>c.second){c1.second=second-c.second;}else{c1.second=second+60-c.second;minute=minute-1;}if(minute>=c.minute){c1.minute=minute-c.minute;}else{c1.minute=minute+60-c.minute;hour=hour-1;}c1.hour=hour-c.hour;return c1;}CTime  CTime::operator+(int s)//返回s秒后的时间{CTime  c1;c1.second=second+s;if(c1.second>=60){c1.minute=minute+c1.second/60;c1.second=c1.second%60;}else{c1.minute=minute;c1.hour=hour;}if(c1.minute>=60){c1.hour=hour+c1.minute/60;c1.minute=c1.minute%60;}else{       c1.minute=minute+c1.second/60;   c1.hour=hour;}if(c1.hour>24){c1.hour=hour%24;}else{c1.hour=hour;}return c1;}CTime  CTime::operator-(int s)//返回s秒前的时间{ CTime  c1;if(second>=s){c1.second=second-s;c1.minute=minute;c1.hour=hour;}else{c1.second=second+60-s;c1.minute=minute-1;if(c1.minute<0){c1.minute=59;c1.hour=hour-1;}else{c1.hour=hour;}return c1;}}//一目运算符的重载CTime CTime::operator++(int)//后置++，下一秒{CTime temp(*this);*this=*this+1;return temp;}CTime CTime::operator++()//前置++，下一秒{*this=*this+1;return (*this);}CTime CTime::operator--(int)//后置--，前一秒{CTime temp(*this);*this=*this-1;    return temp;}CTime CTime::operator--()//前置--，前一秒{*this=*this-1;return (*this);}//赋值运算符的重载     CTime CTime::operator+=(CTime &c){*this=*this+c;return *this;}CTime CTime::operator-=(CTime &c){*this=*this-c;return *this;}CTime CTime::operator+=(int s)//返回s秒后的时间{return(*this+s);}CTime CTime::operator-=(int s)//返回s秒前的时间{return(*this-s);}//定义运算符>>重载函数 istream &operator >> (istream& input,CTime& c) { cout<<"请输入时间"; input>>c.hour>>c.minute>>c.second; return input; }//定义运算符<<重载函数 ostream &operator << (ostream& output,CTime& c) { output<<"("<<c.hour<<":"<<c.minute<<":"<<c.second<<")"; return output; }void main(){CTime t1,t2,t;int s=30;cin>>t1>>t2;cout<<"t1为："<<t1<<endl;cout<<"t2为："<<t2<<endl;cout<<"下面比较两个时间大小：\n";if (t1>t2) cout<<"t1>t2"<<endl;if (t1<t2) cout<<"t1<t2"<<endl;if (t1==t2) cout<<"t1＝t2"<<endl; if (t1!=t2) cout<<"t1≠t2"<<endl;if (t1>=t2) cout<<"t1≥t2"<<endl;if (t1<=t2) cout<<"t1≤t2"<<endl;cout<<endl;//下面自行设计对其他运算符的重载的测试t=t1+t2;cout<<"t1+t2为："<<t<<endl;    t=t2-t1;cout<<"t2-t1为："<<t<<endl;t=t1+s;cout<<"t1+s为："<<t<<endl;t=t1-s;cout<<"t1-s为："<<t<<endl;t=t1++;cout<<"t1++为："<<t<<endl;t=++t1;cout<<"++t1为："<<t<<endl;t=t1--;cout<<"t1--为："<<t<<endl;t=--t1;cout<<"--t1为："<<t<<endl;t1+=t2;cout<<"t1+=t2为："<<t<<endl;t1-=t2;cout<<"t1-=t2为："<<t<<endl;t=t1-=s;cout<<"t1-=s为："<<t<<endl;t=t1+=s;cout<<"t1+=s为："<<t<<endl;system("pause");}

 

运行结果：

上机感言：

其实深入的看书也是学习C++的重要途径！