第八周项目一实现复数类中的运算符重载（3）

/*Copyright(c)2014,烟台大学计算机学院
*Allrights reserved.
*文件名称:MADE2.cpp
*作    者:张生栋
*完成日期:2015年4月29日
*问题描述:定义一个定义完整的类（是可以当作独立的产品发布，成为众多项目中的“基础工程”）。
这样的类在(2)的基础上，扩展+、-、*、/运算符的功能，使之能与double型数据进行运算。设Complex c;
double d; c+d和d+c的结果为“将d视为实部为d的复数同c相加”，其他-、*、/运算符类似
*输入描述:无
*输出描述:略
*版 本 号：v1.0
*/

#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 &c1,Complex &c2);
friend Complex operator+(double d1,Complex &c2);
friend Complex operator+(Complex &c1,double d2);
friend Complex operator-(Complex &c1,Complex &c2);
friend Complex operator-(double d1,Complex &c2);
friend Complex operator-(Complex &c1,double d2);
friend Complex operator*(Complex &c1,Complex &c2);
friend Complex operator*(double d1,Complex &c2);
friend Complex operator*(Complex &c1,double d2);
friend Complex operator/(Complex &c1,Complex &c2);
friend Complex operator/(double d1,Complex &c2);
friend Complex operator/(Complex &c1,double d2);
void display();
private:
double real;
double imag;
};
//下面定义成员函数
Complex operator+(Complex &c1,Complex &c2)
{
Complex c;
c.real=c1.real+c2.real;
c.imag=c1.imag+c2.imag;
return c;
}
Complex operator+(double d1,Complex &c2)
{
Complex c(d1,0);
return c+c2;
}
Complex operator+(Complex &c1,double d2)
{
Complex c(0,d2);
return c1+c;
}
Complex operator-(Complex &c1,Complex &c2)
{
Complex c;
c.real=c1.real-c2.real;
c.imag=c1.imag-c2.imag;
return c;
}
Complex operator-(double d1,Complex &c2)
{
Complex c(d1,0);
return c-c2;
}
Complex operator-(Complex &c1,double d2)
{
Complex c(0,d2);
return c1-c;
}
Complex operator*(Complex &c1,Complex &c2)
{
Complex c;
c.real=c1.real*c2.real-c1.imag*c2.imag;
c.imag=c1.imag*c2.real+c1.real*c2.imag;
return c;
}
Complex operator*(double d1,Complex &c2)
{
Complex c(d1,0);
return c*c2;
}
Complex operator*(Complex &c1,double d2)
{
Complex c(0,d2);
return c1*c;
}
Complex operator/(Complex &c1,Complex &c2)
{
Complex c;
c.real=(c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
c.imag=(c1.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
return c;
}
Complex operator/(double d1,Complex &c2)
{
Complex c(d1,0);
return c/c2;
}
Complex operator/(Complex &c1,double d2)
{
Complex c(0,d2);
return c1/c;
}
void Complex::display()
{
cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
//下面定义用于测试的main()函数
int main()
{
Complex c1(3,4),c2(5,-10),c3;
cout<<"c1=";
c1.display();
cout<<"c2=";
c2.display();
c3=c1+c2;
cout<<"c1+c2=";
c3.display();
c3=c1-c2;
cout<<"c1-c2=";
c3.display();
c3=c1*c2;
cout<<"c1*c2=";
c3.display();
c3=c1/c2;
cout<<"c1/c2=";
c3.display();
return 0;
}