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#includeusing namespace std;#includeshape.hvoid Shape:print()constcoutbase class objectendl;circle:circle(int xValue,int yVal

4、ue,double radiusValue)x=xValue;y=yValue;double circle:getAear() constcoutcircle类的getAear函数，面积是;return 3.14159 * radius * radius;void circle:print() constcoutcenter is;coutx=xy=y;cout,radius isradiusendl;rectangle:rectangle(int aValue,int bValue)a=aValue;b=bValue;double rectangle:getAear() constcoutr

5、ectangle类的getAear函数，面积是;return a * b;void rectangle:getAear() constcouthight isa;coutwidth isbendl;triangle:triangle(int hValue,int wValue)h=hValue;w=wValue;double triangle:getAear() constcouttriangle类的getAear函数，面积是;return w * h/2;void tirangle:getAear() constcouthight ish;coutbase iswendl;trapezoid

6、al:trapezoidal(int cValue,int dValue,int eValue)c=cValue;d=dValue;e=eValue;double trapezoidal:getAear() constcouttrapezoidal类的getAear函数，面积是;return c * d/2 + c * e/2;void trapezoidal:getAear() constcouthight isc;coutbaseline ise;couttopline isdendl;#includeusing namespace std;#include shape.hvoid cre

7、at_object(shape *ptr);void display_area(shape *ptr);void delete_object(shape *ptr);void main()shape *shape_ptr;creat_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

8、对象type;switch(type)casec:int xx,yy;double rr;coutxxyyrr;*ptr=new circle(xx,yy,rr);break;caser:int aa,bb;coutaabb;*ptr=new rectangle(aa,bb);break;caset:int hh,ww;couthhww;*ptr=new triangle(hh,ww);break;casec:int cc,dd,ee;coutccddee;*ptr=new trapezoidal(cc,dd,ee);break;default:cout类型错误请重新选择nwhile(*ptr=NULL);void d