题目内容

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

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