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写出程序运行结果:_________#include const float PI = 3.14; class Base{public: virtual void area() {cout<<"Base 中无实在面积输出！"<area(); p=&obj2; p->area(); return 0;}

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写出程序运行结果:_________#include const float PI = 3.14; class Base{public: virtual void area() = 0; virtual void perimeter() = 0;};class Rectangle:public Base{public: Rectangle(float w,float h) {width = w; height = h; } void area() {cout<<"矩形的长为:"<area(); p->perimeter(); p = &obj2; p->area(); p->perimeter(); return 0;}

写出程序运行结果:_________#includeusing namespace std;class A{public: virtual ~A( ) {cout<<"A::~A( )called "<

写出程序运行结果:_________#includeusing namespace std;class A { public:virtual void func( ){cout<<"func in class A"<

写出程序运行结果:_________#include#includeusing namespace std;class Vehicle{public: virtual void showinfo()=0;protected: char Name[20];};class Car:public Vehicle{public: Car(char *name) {strcpy(Name,name); } void showinfo() {cout<showinfo(); vp=&truck; vp->showinfo(); vp=&boat; vp->showinfo(); return 0;}