第9周-运算符重载(2)-Time类中运算符重载(续)
第9周-运算符重载(二)-Time类中运算符重载(续)
/* * Copyright (c) 2014, 烟台大学计算机学院 * All rights reserved. * 文件名称:test.cpp * 作 者:刘畅 * 完成日期:2015 年 5 月 5 日 * 版 本 号:v1.0 * * 问题描述:(1)定义对时间对象的自增和自减一目运算符 (2)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。 * 输入描述: ; * 程序输出: 按要求输出。
代码如下:
#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); void setTime(int h,int m,int s); void display(); //二目的比较运算符重载 bool operator > (CTime &t); bool operator < (CTime &t); bool operator >= (CTime &t); bool operator <= (CTime &t); bool operator == (CTime &t); bool operator != (CTime &t); //二目的加减运算符的重载 //返回t规定的时,分,秒后的时间 //例t1(8,20,25),t2(11,20,50),t1+t2为19:41:15 CTime operator+(CTime &t); CTime operator-(CTime &t); CTime operator+(int s); CTime operator-(int s); //二目赋值运算符的重载 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 //一目运算符的重载 CTime operator++(int);//后置++,下一秒 CTime operator++();//前置++,下一秒,前置与后置返回值不一样 CTime operator--( int);//后置--,前一秒 CTime operator--();//前置--,前一秒 friend istream& operator >> (istream& input, CTime& c); friend ostream& operator << (ostream& output,const CTime& c); }; CTime::CTime(int h,int m,int s) { hour=h; minute=m; second=s; } void CTime::setTime(int h,int m,int s) { hour=h; minute=m; second=s; } void CTime::display() { cout<<hour<<':'<<minute<<':'<<second<<endl; } bool CTime::operator > (CTime &t) { if (hour>t.hour) return true; if (hour<t.hour) return false; if (minute>t.minute) return true; if (minute<t.minute) return false; if (second>t.second) return true; return false; } bool CTime::operator < (CTime &t) { if (hour<t.hour) return true; if (hour>t.hour) return false; if (minute<t.minute) return true; if (minute>t.minute) return false; if (second<t.second) return true; return false; } bool CTime::operator >= (CTime &t) { if (*this<t) return false; return true; } bool CTime::operator <= (CTime &t) { if (*this>t) return false; return true; } bool CTime::operator == (CTime &t) { if (*this>t||*this<t) return false; return true; } bool CTime::operator != (CTime &t) { if (*this==t) return false; return true; } CTime CTime::operator+(CTime &t) { int h,m,s; s=second+t.second; m=minute+t.minute; h=hour+t.hour; if (s>59) { s-=60; m++; } if (m>59) { m-=60; h++; } if (h>23) h-=24; CTime t0(h,m,s); return t0; } CTime CTime::operator-(CTime &t) { int h,m,s; s=second-t.second; m=minute-t.minute; h=hour-t.hour; if (s<0) { s+=60; m--; } if (m<0) { m+=60; h--; } if (h<0) h+=24; CTime t0(h,m,s); return t0; } CTime CTime::operator+(int s) { int s1=s%60; int m1=(s/60)%60; int h1=s/3600; CTime t0(h1,m1,s1); return *this+t0; } CTime CTime::operator-(int s) { int s1=s%60; int m1=(s/60)%60; int h1=s/3600; CTime t0(h1,m1,s1); return *this-t0; } 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) { *this=*this+s; return *this; } CTime CTime::operator-=(int s) { *this=*this-s; return *this; } CTime CTime::operator++(int) { CTime t=*this; *this=*this+1; return t; } CTime CTime::operator++() { *this=*this+1; return *this; } CTime CTime::operator--(int) { CTime t=*this; *this=*this-1; return t; } CTime CTime::operator--() { *this=*this-1; return *this; } istream& operator >> (istream& input, CTime & c) { int a,b,z; char s,v; do { input>>a>>s>>b>>v>>z; if (s==':'&&v==':') break; }while(1); c.hour=a; c.minute=b; c.second=z; return input; } ostream& operator << (ostream& output,const CTime& c) { output<<c.hour<<':'<<c.minute<<':'<<c.second<<endl; return output; } int main() { CTime t1(8,20,25),t2,t3; cout<<"t1: "; cout<<t1; cout<<"t2: "; cin>>t2; cout<<t2; cout<<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; if (t1!=t2) cout<<"t1!=t2"<<endl; cout<<endl; cout<<"t=t1++"<<endl; t3=t1++; cout<<"t3= "<<t3<<"t1= "<<t1<<endl; cout<<"t=++t1"<<endl; t3=++t1; cout<<"t3= "<<t3<<"t1= "<<t1<<endl; cout<<endl; t3=t1+t2; cout<<t3; t3=t1-t2; cout<<t3; t3=t1+3000; cout<<t3; t3=t1-4800; cout<<t3; t1+=t2; cout<<t1; t1-=t2; cout<<t1; t1+=3000; cout<<t1; t1-=4800; cout<<t1; return 0; }
运行结果:
学习心得:
只是在原来的代码基础上加了六个函数,修改了一下主函数而已,发现这几个函数掌握了,写的前面的那堆函数的东西又忘怎么写了。。。
这个题目碰到了一个问题,当":"冒号我输中文格式的时候,运行窗口它就卡死在那里,不能输入,也没有输出。中文格式的字符都不可以。其它的字符就行,这是为何?