有如下程序：

#include

using namespace std;

class Complex

{

double re, im;

public:

C．omplex(double r, double i):re(r), im(i){}

double real() const{return re;}

double image() const{return im;}

C．omplex& operator +=(Complex a)

{

re += a.re;

im += a.im;

return *this;

}

};

ostream &operator<<(ostream& s,const Complex& z)

{

return s<<'('<

}

int main()

{

C．omplex x(1, -2), y(2, 3);

cout<<(x += y)<

return 0;

}

执行这个程序的输出结果是

A． ． (1, -2)

B． ． (2, 3)

C． ． (3, 5)

D． ． (3, 1)

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