//輸入輸出運算符只能用友元函數重載
#include <iostream>
#include <assert.h>
#include <string.h>

using namespace std;

class Complex
{
?? ?double re,im;
public:
?? ?Complex(double r,double i):re(r),im(i)
?? ?{

?? ?}
?? ?Complex()
?? ?{
?? ??? ?re = 0;
?? ??? ?im = 0;
?? ?}
?? ?Complex operator!();
?? ?Complex operator+(const Complex &obj);
?? ?//重載輸入輸出運算符，只能用友元函數
?? ?friend ostream &operator<<(ostream &os,const Complex &c);
?? ?friend istream &operator>>(istream &is,Complex &c);
};

Complex Complex::operator +(const Complex &obj)
{
?? ?Complex temp;
?? ?temp.re = re + obj.re;
?? ?temp.im = im + obj.im;
?? ?return temp;
}

Complex Complex::operator !()
{
?? ?Complex temp;
?? ?temp.re = -re;
?? ?temp.im = -im;
?? ?return temp;
}

ostream & operator<<(ostream &os,const Complex &c)
{
?? ?os << c.re;
?? ?if(c.im > 0)
?? ??? ?os << "+" << c.im << "i" << endl;
?? ?else
?? ??? ?os << c.im << "i" << endl;
?? ?return os;
}

istream & operator>>(istream &is,Complex &c)
{
?? ?is >> c.re >> c.im;
?? ?return is;
}

int main(int argc,char *argv[])
{
?? ?Complex obj1(1,2),obj2(3,4);
?? ?Complex obj3 = obj1 + !obj2;
?? ?cout << obj3;
?? ?cin >> obj3;
?? ?cout << obj3;
?? ?return 0;
}

總結

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