有下列程序: include using namespace std; class Demo { public: Demo(){cout<<"d

有下列程序： #include＜iostream.h＞ using namespace std; class Demo { public: Demo(){ cout＜＜"default constmctor/n";} Demo(const Demo &x){ cont＜＜"copy constructor/n";} }; Demo userCode(Demo b){Demo c(b);return c;} int

A．1和1

B．1和2

C．2和3

D．2和4

[单选题]有下列程序: include using namespace std; class Base { public: Base(){cout<<"B有下列程序： #include＜iosteram.h＞ using namespace std; class Base { public: Base(){cout＜＜"BB"; f(); } void f(){cout＜＜"Bf";} }; class Derived:public Base { public: Derived(){cout＜＜

[单选题]有下列程序: include using namespace std; classBase { protected: int i; public有下列程序： #include＜iostream.h＞ using namespace std; classBase { protected: int i; public: int j; }; classDerived:public Base { int m; public: intn; }; intA．[1]和[2]B．[1)和[3]C．[2]和[3]

[单选题]有下列程序: include using namespace std; class Stack { public: Stack(unsigned有下列程序： #include＜iosteram.h＞ using namespace std; class Stack { public: Stack(unsignedn=10):size(n){rep_=new int [size];top=O;} Stack(Stack&s):size(s.size) { rep_=new int[size

[单选题]有下列程序: include using namespace std; classTest{ public: Test(){n£«=2;} ~Test有下列程序： #include＜iostream＞ using namespace std; classTest{ public: Test() {n＋＝2;} ～Test() {n-＝3;} static int getNum(){return n;} private: static int n; }; int Test::n＝1； int ma

[主观题]有以下程序: include using namespace std; class sample {int x; public:void setx(有以下程序：include ＜iostream＞using namespace std;class sample{int x;public:void setx(int i){x=i;}int putx (){return x;}};int main ( ){sample *p;sample A[3];A．[0] .set＞:(5);A．[1] .s

[单选题]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

[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]若有以下程序: include using namespace std;class Base{public:Base ( ){x=0;}int x若有以下程序：# include ＜iostream＞using namespace std;class Base{public: Base ( ) { x=0; } int x;};class Derived1 : virtual public Base{public: Derived1 ( ) { x=10; }}; class Derived2