/*******************************************
 *  p9_2.cpp                               *
 * 重載+、-、++為類的成員函數，進行復數運算*
 *******************************************/
#include<iostream>
using namespace std;
class Complex	                                  //復數類定義
{
private:	
    double real;    	//復數實部
    double image;	    //復數虛部

public:	
	Complex(double real=0.0,double image=0.0) //構造函數
	{
		this->real=real,this->image=image;
	}
    void display()
	{
	    cout<<"("<<real<<","<<image<<")"<<endl;
	}
	Complex operator + (Complex B);	        //運算符+重載成員函數
	Complex operator - (Complex B);	        //運算符-重載成員函數
    Complex operator - ();	                   //運算符-(取負)重載成員函數
    Complex operator ++ ();                 //前置++重載成員函數
	Complex operator ++ (int);              //后置++重載成員函數
};	                                     

Complex Complex::operator +(Complex B)	 //重載運算符+的函數實現
{
	return Complex(real+B.real, image+B.image); //創建一個臨時對象作為返回值
}
Complex Complex::operator -(Complex B)	    //重載運算符-的函數實現
{
	return Complex(real-B.real, image-B.image);     
}
Complex Complex::operator -()	            //重載運算符-(取負)的函數實現
{
	return Complex(-real,-image); 
}
Complex Complex::operator ++()	        //重載運算符前置++的函數實現
{
	return Complex(++real,image); 
}
Complex Complex::operator ++(int)	         //重載運算符后置++的函數實現
{
	return Complex(real++,image); 
}
void main()	
{
	Complex A(100.0,200.0),B(-10.0,20.0),C;	
	cout<<"A=",        A.display(); 
	cout<<"B=",        B.display();
   	C=A+B;                          //使用重載運算符完成復數加法
	cout<<"C=A+B=",    C.display();
    C=A-B;	                       //使用重載運算符完成復數減法
	cout<<"C=A-B=",    C.display();
    C=-A+B;
    cout<<"C=-A+B=",   C.display();
	C=A++;
	cout<<"C=A++, C=", C.display();
    C=++A;
    cout<<"C=++A, C=", C.display();
	C=A+5;	           
	C.display();
	cin.get();
}