#include <iostream>
using namespace std;

class complex
{
private:
    double real;
  	double image;
public:
    complex ( ); //缺省構(gòu)造函數(shù)
  	complex (double r, double i); //順便初始化值的構(gòu)造函數(shù)
   	complex operator +(complex x); //計算A+B
  	complex operator ++( ); //計算++A
  	complex operator --(int); //計算A-
	complex operator =(double x); //把一個double賦給一個complex時該怎么辦
	//系統(tǒng)還自動生成了一個complex operator=(complex);，它的實現(xiàn)是簡單拷貝
    //所以如果類中有指針成員，它會像默認(rèn)的拷貝構(gòu)造函數(shù)那樣出問題L
	//我們?nèi)绻貙懰€要注意檢查自己賦給自己的情況
  	void print(); //輸出復(fù)數(shù)
};


complex::complex( )
{
    real=0.0f;
    image=0.0f;
}

complex::complex(double r, double i)
{
    real=r;
  	image=i;
}

complex complex::operator +(complex x)
{
   	complex c;
  	c.real=real+x.real;
   	c.image=image+x.image;
   	return c;
}

complex complex::operator ++( )
{
   	complex c;
	++real;
  	c.real=real;
   	c.image=image;
   	return c;
}

complex complex::operator --(int)
{
	complex c;
  	c.real=real;
   	c.image=image;
    real--;
    return c;
}

complex complex::operator =(double x)
{
	real=x;
	return *this; //按照C++的慣例，返回*this，以便實現(xiàn)鏈?zhǔn)奖磉_(dá)式
}

void complex::print( )
{
    cout<<real<<"+"<<image<<"i"<<endl;
}

void main( )
{
    complex a(1,2);
    complex b(4,5);
    complex c=a+b;
    complex d=++a;
    complex e=b--;
    //complex f=0.234; //這樣寫現(xiàn)在還不行，因為上面沒寫相應(yīng)的拷貝構(gòu)造函數(shù)
					 //你可以試著寫一個
    complex f;
    f=a=0.234; //鏈?zhǔn)奖磉_(dá)式
    a.print( );
    c.print( );
    d.print( );
    e.print( );
    f.print( );
}