/*
實驗目的:1.學會定義類中雙目和單目運算符的重載函數
2.學會使用類的成員函數和友元函數實現運算符的重載
* 程序的版權和版本聲明部分
* Copyright (c) 2011, 煙臺大學計算機學院學生
* All rights reserved.
* 文件名稱:方案一 用類的重載運算符 +、-、*、/,使之能用於複數的加減乘除
* 作 者: 晁 陽
* 完成日期: 2012年 4 月 9 日
* 版 本 號: t.10
* 對任務及求解方法的描述部分
* 代碼實現
#include <iostream>
using namespace std;
class Complex
{
public:
Complex(){real=0;imag=0;}
Complex(double r,double i){ real=r;imag=i;}
friend Complex operator+(Complex &c,const double &d);//聲明重載運算符“+”的函數(複數加實數)
friend Complex operator+(Complex &c,const double &d);//聲明重載運算符“+”的函數(複數加實數)
friend Complex operator-(Complex &c,const double &d);//聲明重載運算符“-”的函數(複數加實數)
friend Complex operator*(Complex &c,const double &d);//聲明重載運算符“*”的函數(複數加實數)
friend Complex operator/(Complex &c,const double &d);//聲明重載運算符“/”的函數(複數加實數)
friend Complex operator + (const double &d, Complex &c);//友元函數聲明(實數加複數)
friend Complex operator - (const double &d, Complex &c);//友元函數聲明(實數加複數)
friend Complex operator * (const double &d, Complex &c);//友元函數聲明(實數加複數)
friend Complex operator / (const double &d, Complex &c);//友元函數聲明(實數加複數)
friend Complex operator -(Complex &c);//聲明一目運算符“-”函數
void display();
void display1();
private:
double real;
double imag;
};
//下面定義成員函數Complex Complex::operator + (double &d)
Complex operator + (Complex &c, const double &d)//定義重載運算符“+”的函數
{
Complex c1;
return Complex(c1.real= c.real+d, c1.imag = c.imag);
}
Complex operator-(Complex &c,const double &d)//定義重載運算符“-”的函數
{
Complex c1;
return Complex( c1.real = c.real-d, c1.imag = c.imag);
}
Complex operator*(Complex &c,const double &d)//定義重載運算符“*”的函數
{
Complex c1;
return Complex(c.real*d, c.imag);
}
Complex operator/(Complex &c,const double &d)//定義重載運算符“/”的函數
{
Complex c1;
return Complex(c.real/d, c.imag);
}
Complex operator + (const double &d, Complex &c)//定義友元函數(實數+複數)
{
Complex c1;
return Complex(c.real+d, c.imag);
}
Complex operator - (const double &d, Complex &c)//定義友元函數(實數-複數)
{
Complex c1;
return Complex(c.real-d, c.imag);
}
Complex operator * (const double &d, Complex &c)//定義友元函數(實數*複數)
{
Complex c1;
return Complex(c.real*d, c.imag);
}
Complex operator / (const double &d, Complex &c)//定義友元函數(實數/複數)
{
Complex c1;
return Complex(c.real/d, c.imag);
}
Complex operator - (Complex &c)//定義一目運算符“-”函數 一目運算符只能用
{return Complex( 0 - c.real,c.imag);}
void Complex::display()
{
cout << "(" <<real<<","<<imag<<"i)"<<endl;
}
int main()
{
Complex c(3,4),c1;
c1=c+5;
cout<<"c+5=";
c.display();
c=c-5;
cout<<"c-5=";
c.display();
c=c*5;
cout<<"c*5=";
c.display();
c=c-5;
cout<<"c/5=";
c.display();
c=5+c;
cout<<"5+c=";
c.display();
c=5-c;
cout<<"5-c=";
c.display();
c=5*c;
cout<<"5*c=";
c.display();
c=5/c;
cout<<"5/c=";
c.display();
c = -c;
cout << "- c1 =" ;
c.display();
system("pause");
return 0;
}
上機感言:通過友元函數定義,來實現運算符功能的拓展,注意在: 複數+實數定義時這樣:Complex operator + (Complex &c, const double &d) 複數在前;
實數+複數定義時這樣:Complex operator + (const double &d, Complex &c)實數在前;
上圖: