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以下程序运行结果中第一行到第三行分别是、和。#includeusing namespace std;class Base{int x;public:Base(int b): x(b){}virtual void display(){cout<display();return 0;}

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有如下程序：#include using namespace std;class Animal{public:virtual char* getType()const { return "Animal";}virtual char* getVoice()const { return "Voice";}};class Dog: public Animal {public:char* getType ( ) const {return "Dog";}char* getVoice ( ) const {return "Woof";}};void type(Animal &a) {cout<

如下程序运行时的输出结果是。#includeusing namespace std;class Base{public:Base(){ }virtual void f(){cout<<"A";}};class D1: public Base {public:D1(){ }virtual void f() const{cout<<"B";}};class D2: public D1 {public:virtual void f(){cout<<"C";}};void fun(Base &b){ b.f(); }int main(){Base b; D1 d1; D2 d2;fun(b);fun(d1);fun(d2);b.f();d1.f();d2.f();return 0;}

完善程序，使其运行时的输出结果如下：f1 function of derivef2 function of basef4 function of base#include using namespace std;class base{public:void f1(){cout<<"f1 function of base"<< endl; }virtual void f2(){cout<<"f2 function of base "<< endl; }void f4(){cout<<"f4 function of base "<f1();p->f2();p->f4();return 0;}

请将如下程序补充完整，使程序的输出结果如下：Derived::Print: 5Derived destructorBase destructor源程序清单：#include using namespace std;class BaseClass{public:~BaseClass();virtual void Print();};BaseClass::~BaseClass(){cout<< "Base destructor" << endl; }void BaseClass::Print(){cout << "BaseClass::Print" << endl;}class Derived:BaseClass{public:Derived();~Derived();void Print();private:int p;};Derived::Derived(){p =;}Derived::~Derived() {cout << "Derived destructor" << endl;delete p;}void Derived::Print(){cout << "Derived::Print: " <<p<< endl;}void fun(BaseClass* b) {b->Print();delete b;}int main() {BaseClass *ptr = ;fun(ptr);return 0;}