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有如下程序：#includeusing namespace std;class Pet{char name[10];public:Pet(char name){ strcpy(this->name,name);}const char getName()const{return name;}virtual void call()const=0;};class Dog: public Pet{public:Dog(char name):Pet(name){}void call()const{ cout<<"汪汪叫";}};class Cat:public Pet{public:Cat(char name):Pet(name){}void call()const{ cout<<"喵喵叫";}};int main(){Pet pet1=new Dog("哈克"), pet2=new Cat("吉米");cout<getName();pet1->call();cout<

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如下程序声明了一个二维图形类TwoDShape，从其派生出矩形类Rec。#include#includeusing namespace std;class TwoDShape{ //二维图形类.char name[20];public:TwoDShape(char n="unknown"){strcpy(name,n);}char getName(){return name;}__________________________=0;};class Rec:public TwoDShape{double width,height;public:Rec(double w=0.0,double h=0.0):TwoDShape("rectangle"){width=w;height=h;}double getWidth(){return width;}double getHeight(){return height;}double area(){return widthheight;}};int main(){TwoDShape shape;shape=new Rec(2.1,3.0);cout<<"object is "<getName()<<"\n",cout<<"Area is "<area()<<"\n";return 0;}请将程序补充完整，使程序在运行时输出：object is triangleArea is 6.3

有如下程序：#includeusing namespace std;class Base{int b;public:Base(int i){b=i;}void disp(){cout<<"Base:b="<
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请将如下程序补充完整，使得输出结果为：bbaa#includeusing namespace std;class A{public:______{cout<<"aa"; }};class B: public A {public:~B(){cout<<"bb";}};int main (){B *p=new B;delete p;return 0;}

请在如下程序中的空格处填写正确的语句：# include using namespace std;class Base{public:void fun() {cout<<"Base fun"<