第八周实验报告（一）《方案三》拓展运算符功能

/*

实验目的：1.学会定义类中双目和单目运算符的重载函数

          2.学会使用类的成员函数和友元函数实现运算符的重载

* 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：方案一 用类的重载运算符 +、-、*、/，使之能用于复数的加减乘除                             

* 作    者：  晁 阳                           

* 完成日期：  2012年 4 月 9 日

* 版 本 号： t.10        

* 对任务及求解方法的描述部分

* 代码实现

#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);//声明重载运算符“+”的函数（复数加实数）
friend Complex operator+(Complex &c,const double &d);//声明重载运算符“+”的函数（复数加实数）
friend Complex operator-(Complex &c,const double &d);//声明重载运算符“-”的函数（复数加实数）
friend Complex operator*(Complex &c,const double &d);//声明重载运算符“*”的函数（复数加实数）
friend Complex operator/(Complex &c,const double &d);//声明重载运算符“/”的函数（复数加实数）
friend Complex operator + (const double &d, Complex &c);//友元函数声明（实数加复数）
friend Complex operator - (const double &d, Complex &c);//友元函数声明（实数加复数）
friend Complex operator * (const double &d, Complex &c);//友元函数声明（实数加复数）
friend Complex operator / (const double &d, Complex &c);//友元函数声明（实数加复数）
friend Complex operator -(Complex &c);//声明一目运算符“-”函数
void display();
void display1();
private:
double real;
double imag;
};
//下面定义成员函数Complex Complex::operator + (double &d)

Complex operator + (Complex &c, const double &d)//定义重载运算符“+”的函数
{
Complex c1;
return Complex(c1.real= c.real+d, c1.imag = c.imag);
}

Complex operator-(Complex &c,const double &d)//定义重载运算符“-”的函数
{
Complex c1;
return Complex( c1.real = c.real-d, c1.imag = c.imag);
}

Complex operator*(Complex &c,const double &d)//定义重载运算符“*”的函数
{
Complex c1;
return Complex(c.real*d, c.imag);
}

Complex operator/(Complex &c,const double &d)//定义重载运算符“/”的函数
{
Complex c1;
return Complex(c.real/d, c.imag);
}

Complex operator + (const double &d, Complex &c)//定义友元函数（实数+复数）
{
Complex c1;
return Complex(c.real+d, c.imag);
}

Complex operator - (const double &d, Complex &c)//定义友元函数（实数-复数）
{
Complex c1;
return Complex(c.real-d, c.imag);
}

Complex operator * (const double &d, Complex &c)//定义友元函数（实数*复数）
{
Complex c1;
return Complex(c.real*d, c.imag);
}

Complex operator / (const double &d, Complex &c)//定义友元函数（实数/复数）
{
Complex c1;
return Complex(c.real/d, c.imag);
}

Complex operator - (Complex &c)//定义一目运算符“-”函数  一目运算符只能用
{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;
}

上机感言：通过友元函数定义，来实现运算符功能的拓展，注意在： 复数+实数定义时这样：Complex operator + (Complex &c, const double &d) 复数在前；                                                                                                                          实数+复数定义时这样：Complex operator + (const double &d, Complex &c)实数在前；上图：