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)

[单选题]有如下程序: include using namespace std; class Base { public:有如下程序： #include＜iostream＞ using namespace std; class Base { public: void fun() { cout＜＜"Base::fun"＜＜endl; } }; class Derived: public Base { public: void tim() } ____________ cout＜＜"Derived::

[单选题]有如下程序: include using namespace std; class A { public: A(){cout<<"A";} ~A()有如下程序： #include＜iostream＞ using namespace std; class A { public: A(){cout＜＜"A";} ～A(){cout＜＜"～A";) }; class B:public A { A*p; public: B(){cout＜＜"B";p=new A;} ～B(){cout＜

[单选题]有如下程序: include using namespace std; class TestClass { private: int x,y; pu有如下程序： #include＜iostream＞ using namespace std; class TestClass { private: int x,y; public: TestClass (int i,int j) { x=i; y=j; } void print() { cout＜＜"print1"＜＜end1; } void p

[单选题]有如下程序: include using namespace std; class Sample{ public:有如下程序： #include＜iostream＞ using namespace std； class Sample{ public： Sample()＜) ～Sample(){cout＜＜'*';} }； int main(){ Sample temp[2]，*pTemp[2]； return 0； } 执行这个程序输出星号(*)的个数为( )。A．1B．2C．3D．4

[单选题]有如下程序: include using namespace std; class Demo有如下程序： #include＜iostream＞ using namespace std; class Demo { public: Demo(){ cout＜＜"default constructor/n";} Demo(const Demo & x){ cout＜＜"copy constructor/n":} }; Demo userCode(Demo b){DemoC(b);ret

[单选题]有如下程序 include using namespace std; class A{ public: vi有如下程序 #include ＜iostream＞ using namespace std; class A{ public: virtual void funcl( ){ cout＜＜"A1"; } void func2( ) { cout＜＜"A2"; }; class B:public A { public: void funcl( ){ cout＜＜"B1"; } v

[单选题]有如下程序 include using namespace std; class Base { protected:有如下程序 #include ＜iostream＞ using namespace std; class Base { protected: Base( ){cout＜＜'A'; } Base(char c) { cout＜＜c; } }; class Derived: public Base { public: Derived(char c){ cout＜＜c; } };

[单选题]有如下程序: include using namespace std; class Base{ int x; pu有如下程序： #include＜iostream＞ using namespace std； class Base{ int x； public： Base(int n＝0):x(n){cout＜＜n;) int getX()const{return x;} }； class Derived:public Base{ int y； public： Derived(int m，int

[单选题]有如下程序: include using namespace std; class Amount{ int amount有如下程序： #include＜iostream＞ using namespace std； class Amount{ int amount； public： Amount(int n=0):amount(n){} int getAmount()const{return amount;} Amount&operator9＝(Amount a){ amount+=a.

[单选题]有如下程序: include using namespace std; class BASE { public有如下程序： #include＜iostream＞ using namespace std; class BASE { public: ～BASE(){cout＜＜"BASE";} }; class DERIVED:public BASE { public: ～DERIVED(){cout＜＜"DERIVED";} }; int main(){DERIVEDx;retum 0;}