本文主要是介绍第九周任务二:CTime类的扩展,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
* (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!
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