有如下程序: include using namespace std; class Complex { double re, im, public 有如下程序: #include <iostream> using namespace std; class Complex { double re, im, public: Complex(double r, double i): re(r), im(i) {} double real() const {return re;} double image() const {return im,} Complex operator +=(Complex a) { re +=a.re; im +=a.im; return *this; } }; ostream operator << (ostream s, const Complex z) { return s<<'('<<z.real()<<','<<z.image()<<')'; } int main() { Complex x(1,-2), y(2,3); cout << (x+=y) << endl; 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)

有如下程序: include using namespace std; class Complex { double re, im, public

有如下程序: #include <iostream> using namespace std; class Complex { double re, im, public: Complex(double r, double i): re(r), im(i) {} double real() const {return re;} double image() const {return im,} Complex& operator +=(Complex a) { re +=a.re; im +=a.im; return *this; } }; ostream& operator << (ostream& s, const Complex& z) { return s<<'('<<z.real()<<','<<z.image()<<')'; } int main() { Complex x(1,-2), y(2,3); cout << (x+=y) << endl; 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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有如下程序: include using namespace std; class Complex { dou 有如下程序: #include<iostream> using namespace std; class Complex { double re, im; public: Complex(double r, double i): re(r), im(i) {} double real() const { return re; } double image() const { return im; } Complex operator+= (Complex a) { re += a.re; im += a.im; return *this; } }; ostream operator<<(ostream s, const Complex z) { remm s<<'('<<z.real()<<','<<z.image()<<')'; } int main() { Complex x(1,-2), y(2,3); cout<<(x+=y)<<endl; 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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