數具有如下形式：

        realPart+imaginaryPart*i。

   用double變量表示該類的private資料：realPart（實部）和imaginaryPart（虛部）。提供一個無參建構函式，使realPart和imaginaryPart均為0；一個有參建構函式，使物件在宣告時就得以初始化。提供public的成員函式：

①　Complex ComPlexAdd(Complex &a);//完成當前物件與引用物件a的複數相加

                               //即兩個物件的實部相加，虛部相加

                               //將計算結果返回

②　Complex ComPlexSub(Complex &b);//完成當前物件與引用物件a的複數相減

③　void  Print();    //輸出複數

#include<iostream>
using namespace std;
class Complex
{
private:
	double realPart;
	double imaginaryPart;
public:
	Complex()
	{
		realPart=0;
		imaginaryPart=0;
	}
	Complex(double a,double b)
	{
		realPart=a;
		imaginaryPart=b;
	}
	Complex ComPlexAdd(Complex &a)
	{
		realPart+=a.realPart ;
		imaginaryPart+=a.imaginaryPart;
		return Complex(realPart,imaginaryPart);
	} 
	Complex ComPlexSub(Complex &b)
	{
		realPart-=b.realPart ;
		imaginaryPart-=b.imaginaryPart;
		return Complex(realPart,imaginaryPart);
	}
	void Print()
	{
		cout<<realPart<<"+"<<imaginaryPart<<"i"<<endl;
	}
};
int main()
{
	Complex a = Complex();
	Complex b = Complex(3,4);
	Complex c = Complex(2,3);
	a.Print();
	a.ComPlexAdd(b);
	a.Print();
	a.ComPlexSub(c);
	a.Print();
return 0;
}