求不同图形的面积

1、求不同图形的面积（圆，矩形，三角形，梯形）/shape.hclass shape/基类shape的定义public:virtual double getArea() const=0;/纯虚函数void print() const;virtual Shape()/需析构函数;class Circle:public Shapepublic:Circle(int=0,int=0,double=0.0);double getArea() const;/返回面积void print() const;/输出Circle类对象private:int x,y;/圆心坐标double radius;/圆半径;c

2、lass Rectangle:public Shapepublic:Rectangle(int=0,int=0);/构造函数double getAear() const;/返回面积void print() const;/输出Rectangle类对象private:int a,b;/矩形的长和宽;class triangle:public Shapepublic:triangle(int=0,int=0);/构造函数double getAear() const;/返回面积void printf() const;/输出triangle类对象private:int h,w;/三角形的高和底;clas

3、s trapezoidal:public Shapepublic:trapezoidal(int=0,int=0,int=o);/构造函数double getAear() const;/返回面积void printf() const;/输出trapezoidal类对象private:int c,d,e;/梯形的高和上底和下底;/ shape.cpp#include<iostream>using namespace std;#include"shape.h"void Shape:print()constcout<<"base class ob

4、ject"<<endl;circle:circle(int xValue,int yValue,double radiusValue)x=xValue;y=yValue;double circle:getAear() constcout<<"circle类的getAear函数，面积是"return 3.14159 * radius * radius;void circle:print() constcout<<"center is"cout<<"x="<<x<

5、<"y="<<y;cout<<",radius is"<<radius<<endl;rectangle:rectangle(int aValue,int bValue)a=aValue;b=bValue;double rectangle:getAear() constcout<<"rectangle类的getAear函数，面积是"return a * b;void rectangle:getAear() constcout<<"hight is&q

6、uot;<<a;cout<<"width is"<<b<<endl;triangle:triangle(int hValue,int wValue)h=hValue;w=wValue;double triangle:getAear() constcout<<"triangle类的getAear函数，面积是"return w * h/2;void tirangle:getAear() constcout<<"hight is"<<h;cout<&l

7、t;"base is"<<w<<endl;trapezoidal:trapezoidal(int cValue,int dValue,int eValue)c=cValue;d=dValue;e=eValue;double trapezoidal:getAear() constcout<<"trapezoidal类的getAear函数，面积是"return c * d/2 + c * e/2;void trapezoidal:getAear() constcout<<"hight is"

8、<<c;cout<<"baseline is<<e;cout<<"topline is"<<d<<endl;#include<iostream>using namespace std;#include "shape.h"void creat_object(shape *ptr);void display_area(shape *ptr);void delete_object(shape *ptr);void main()shape *shape_ptr;crea

9、t_object(&shape_ptr);display_area(shape_ptr);delete_object(shape_ptr);void creat_object(shape*ptr)char type;*ptr=NULL;docount<<"创建对象。c:circle类对象；r:rectangle类对象；t:triangle类对象；p:trapezoidal类对象"<<endl;cin>>type;switch(type)case'c':int xx,yy;double rr;cout<<

10、"请输入圆心的坐标和圆的半径："cin>>xx>>yy>>rr;*ptr=new circle(xx,yy,rr);break;case'r':int aa,bb;cout<<"请输入矩形的长和宽："cin>>aa>>bb;*ptr=new rectangle(aa,bb);break;case't':int hh,ww;cout<<"请输入三角形的高和底："cin>>hh>>ww;*ptr=new triangle(hh,ww);break;case'c':int cc,dd,ee;cout<<"请输入梯形的高和上底和下底："cin>>cc>>dd>>ee;*ptr=new trapezoidal(cc,dd,ee);break;default:cout<<"类型错误请重新选择n"while(*ptr=NUL