/* * Copyright (c) 2013, 煙台大學電腦學院 * All rights reserved. * 檔案名稱:test.cpp * 作者:邱學偉 * 完成日期:2013 年4 月 23 日 * 版本號碼:v1.0 * 輸入描述:無 * 問題描述:定義各種運算子多載函數 * 程式輸出:* 問題分析: * 演算法設計:略 */ #include <iostream>using namespace std;class CTime{private:unsigned short int hour; // 時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();//比較子(二目)的重載bool operator > (CTime &t);bool operator < (CTime &t);bool operator >= (CTime &t);bool operator <= (CTime &t);bool operator == (CTime &t);bool operator != (CTime &t);//二目運算子的重載CTime operator+(CTime &c);//返回c所規定的時、分、秒後的時間,例t1(8,20,25),t2(11,20,50),t1+t2為:41:15CTime operator-(CTime &c);//對照+理解CTime operator+(int s);//返回s秒後的時間CTime operator-(int s);//返回s秒前的時間//一目運算子的重載CTime operator++( int);//後置++,下一秒CTime operator++();//前置++,下一秒,前置與後置傳回值不一樣CTime operator--( int);//後置--,前一秒CTime operator--();//前置--,前一秒//賦值運算子的重載CTime operator+=(CTime &c);CTime operator-=(CTime &c);CTime operator+=(int s);CTime operator-=(int s);};//下面實現所有的運算子多載代碼。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;}//比較子的重載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; if(second<t.second) 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; if(second>t.second) return false;}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;}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;}//二目運算子多載CTime CTime::operator +(CTime &t){ int h,m,s; h=hour+t.hour; m=minute+t.minute; s=second+t.second; 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 +(int s){ int ss=s%60; int mm=(s/60)%60; int hh=s/3600; CTime t0(hh,mm,ss); return *this+t0;}//時間之差CTime CTime::operator -(CTime &t){ int h,m,s; h=hour-t.hour; m=minute-t.minute; s=second-t.second; if(s<0) { s+=60; m--; } if(m<0) { m+=60; h--; } if(h>23) h+=24; CTime t0(h,m,s); return t0;} //返回s秒後的時間 CTime CTime::operator -(int s) { int ss=s%60; int mm=(s/60)%60; int hh=s/3600; CTime t0(hh,mm,ss); return *this-t0; }//一目運算子的重載CTime CTime::operator++(int)//後置++,下一秒{ CTime t=*this; *this=*this+1; return t;}CTime CTime::operator++()//前置++,下一秒{ *this=*this+1; return *this;}CTime CTime::operator--(int)//後置--,前一秒{ CTime t=*this; *this=*this-1; return t;}CTime CTime::operator--()//前置--,前一秒{ *this=*this-1; return *this;}//賦值運算子的重載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秒後的時間{ *this=*this+s; return *this;}CTime CTime::operator-=(int s)//返回s秒前的時間{ *this=*this-s; return *this;}int main(){ CTime t1(8,20,25),t2(11,20,50),t; cout<<"t1為:"; t1.display(); cout<<"t2為:"; t2.display(); cout<<"下面比較兩個時間大小:\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; //在測試下面的代碼時,採用逐步執行的方法跟蹤 t=t1++; t=++t1; t1--; --t1; t=t1+t2; t=t1-t2; t=t1+2000; t=t1-5000; t1+=t2; t1-=t2; t1+=2000; t1-=5000; return 0;}
心得體會:理解起來有難度,絕大多數是照搬。