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有如下程序：#include using namespace std;class MyClass {public:MyClass() { ++count; }~MyClass() { --count; }static int getCount() { return count; }private:static int count;};int MyClass::count=0;int main(){MyClass obj;cout<
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有如下程序：#include#includeusing namespace std;class Animal{public:virtual string GetType() const { return "Animal"; }virtual string GetVoice() const { return "Voice"; }};class Dog:public Animal{public:string GetType() const { return "Dog"; }string GetVoice() const { return "Woof"; }};class Cat:public Animal{public:string GetType() const { return "Cat"; }string GetVoice() const { return "Miaow"; }};void Type(Animal& a) { cout<
有如下程序：#include using namespace std;class B {public:virtual void show() { cout<<"B"; }};class D: public B {public:void show() { cout<<"D"; }};void fun1(B *ptr) { ptr->show(); }void fun2(B &ref) { ref.show(); }void fun3(B b) { b.show(); }int main(){B b,*p=new D;D d;fun1(p);fun2(b);fun3(d);delete p;return 0;}执行这个程序的输出结果是()。
有如下程序：#include using namespace std;class A {public:virtual void func1() { cout<<"A1"; }void func2() { cout<<"A2"; }};class B:public A {public:void func1() { cout<<"B1"; }void func2() { cout<<"B2"; }};int main() {A *p=new B;p->func1();p->func2();delete p;return 0;}执行这个程序的输出结果是()。
有如下程序：#include using namespace std;class Base{public:void fun1() { cout<<"Base\n"; }virtual void fun2() { cout<<"Base\n"; }};class Derived : public Base {public:void fun1() { cout<<"Derived\n"; }void fun2() { cout<<"Derived\n"; }};void f(Base& b) { b.fun1(); b.fun2(); }int main(){Derived obj;f(obj);return 0;}执行这个程序的输出结果是()。
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