分數類中的運算子過載(續)
阿新 • • 發佈:2019-01-23
問題及程式碼:
/* * Copyright (c) 2014, 煙臺大學計算機學院 * All rights reserved. * 檔名稱:test.cpp * 作 者:李盈盈 * 完成日期:2015年 05 月 10 日 * 版 本 號:v1.0 * * 問題描述:定義分數的一目運算子+和-,分別代表分數取正和求反,將~過載為分數的求倒數運算。 * 輸入描述:輸入兩個分數。 * 程式輸出:按要求輸出。 */ #include <iostream> #include <Cmath> using namespace std; class CFraction { private: int nume; int deno; public: CFraction(int nu=0,int de=1):nume(nu),deno(de) {} void simplify(); friend istream &operator>>(istream &in,CFraction &x); friend ostream &operator<<(ostream &out,CFraction x); CFraction operator+(const CFraction &c); CFraction operator-(const CFraction &c); CFraction operator*(const CFraction &c); CFraction operator/(const CFraction &c); CFraction operator+(); CFraction operator-(); CFraction operator~(); bool operator>(const CFraction &c); bool operator<(const CFraction &c); bool operator==(const CFraction &c); bool operator!=(const CFraction &c); bool operator>=(const CFraction &c); bool operator<=(const CFraction &c); }; void CFraction::simplify() { int m,n,r; n=fabs(deno); m=fabs(nume); while((r=m%n)!=0) { m=n; n=r; } deno/=n; nume/=n; if (deno<0) { deno=-deno; nume=-nume; } } istream &operator>>(istream &in,CFraction &x) { char ch; while(1) { cin>>x.nume>>ch>>x.deno; if (x.deno==0) cerr<<"分母為0, 請重新輸入\n"; else if(ch!='/') cerr<<"格式錯誤(形如m/n)! 請重新輸入\n"; else break; } return cin; } ostream &operator<<(ostream &out,CFraction x) { cout<<x.nume<<'/'<<x.deno; return cout; } CFraction CFraction::operator+(const CFraction &c) { CFraction t; t.nume=nume*c.deno+c.nume*deno; t.deno=deno*c.deno; t.simplify(); return t; } CFraction CFraction:: operator-(const CFraction &c) { CFraction t; t.nume=nume*c.deno-c.nume*deno; t.deno=deno*c.deno; t.simplify(); return t; } CFraction CFraction:: operator*(const CFraction &c) { CFraction t; t.nume=nume*c.nume; t.deno=deno*c.deno; t.simplify(); return t; } CFraction CFraction:: operator/(const CFraction &c) { CFraction t; if (!c.nume) return *this; t.nume=nume*c.deno; t.deno=deno*c.nume; t.simplify(); return t; } CFraction CFraction:: operator+() { return *this; } CFraction CFraction:: operator-() { CFraction x; x.nume=-nume; x.deno=deno; return x; } CFraction CFraction:: operator~() { CFraction x; x.nume=deno; x.deno=nume; if(x.deno<0) { x.deno=-x.deno; x.nume=-x.nume; } return x; } bool CFraction::operator>(const CFraction &c) { int this_nume,c_nume,common_deno; this_nume=nume*c.deno; c_nume=c.nume*deno; common_deno=deno*c.deno; if ((this_nume-c_nume)*common_deno>0) return true; return false; } bool CFraction::operator<(const CFraction &c) { int this_nume,c_nume,common_deno; this_nume=nume*c.deno; c_nume=c.nume*deno; common_deno=deno*c.deno; if ((this_nume-c_nume)*common_deno<0) return true; return false; } bool CFraction::operator==(const CFraction &c) { if (*this!=c) return false; return true; } bool CFraction::operator!=(const CFraction &c) { if (*this>c || *this<c) return true; return false; } bool CFraction::operator>=(const CFraction &c) { if (*this<c) return false; return true; } bool CFraction::operator<=(const CFraction &c) { if (*this>c) return false; return true; } int main() { CFraction x,y,s; cout<<"輸入x: "; cin>>x; cout<<"輸入y: "; cin>>y; s=+x+y; cout<<"+x+y="<<s<<endl; s=x-y; cout<<"x-y="<<s<<endl; s=x*y; cout<<"x*y="<<s<<endl; s=x/y; cout<<"x/y="<<s<<endl; cout<<"-x="<<-x<<endl; cout<<"+x="<<+x<<endl; cout<<"x的倒數: "<<~x<<endl; cout<<x; if (x>y) cout<<"大於"; if (x<y) cout<<"小於"; if (x==y) cout<<"等於"; cout<<y<<endl; return 0; }
執行結果: