求不同圖形的面積參考模板

1、求不同圖形的面積（圓，矩形，三角形，梯形）/shape.hclass shape/基類shape的定義public:virtual double getArea() const=0;/純虛函數(shù)void print() const;virtual Shape()/需析構(gòu)函數(shù);class Circle:public Shapepublic:Circle(int=0,int=0,double=0.0);double getArea() const;/返回面積void print() const;/輸出Circle類對象private:int x,y;/圓心坐標double radius;/圓半徑;c

2、lass Rectangle:public Shapepublic:Rectangle(int=0,int=0);/構(gòu)造函數(shù)double getAear() const;/返回面積void print() const;/輸出Rectangle類對象private:int a,b;/矩形的長和寬;class triangle:public Shapepublic:triangle(int=0,int=0);/構(gòu)造函數(shù)double getAear() const;/返回面積void printf() const;/輸出triangle類對象private:int h,w;/三角形的高和底;clas

3、s trapezoidal:public Shapepublic:trapezoidal(int=0,int=0,int=o);/構(gòu)造函數(shù)double getAear() const;/返回面積void printf() const;/輸出trapezoidal類對象private:int c,d,e;/梯形的高和上底和下底;/ shape.cpp#include<iostream>1 / 4using namespace std;#include"shape.h"void Shape:print()constcout<<"base cla

4、ss object"<<endl;circle:circle(int xValue,int yValue,double radiusValue)x=xValue;y=yValue;double circle:getAear() constcout<<"circle類的getAear函數(shù)，面積是"return 3.14159 * radius * radius;void circle:print() constcout<<"center is"cout<<"x="<<

5、x<<"y="<<y;cout<<",radius is"<<radius<<endl;rectangle:rectangle(int aValue,int bValue)a=aValue;b=bValue;double rectangle:getAear() constcout<<"rectangle類的getAear函數(shù)，面積是"return a * b;void rectangle:getAear() constcout<<"hight

6、 is"<<a;cout<<"width is"<<b<<endl;triangle:triangle(int hValue,int wValue)h=hValue;w=wValue;double triangle:getAear() constcout<<"triangle類的getAear函數(shù)，面積是"return w * h/2;void tirangle:getAear() constcout<<"hight is"<<h;cout&

7、lt;<"base is"<<w<<endl;trapezoidal:trapezoidal(int cValue,int dValue,int eValue)c=cValue;d=dValue;e=eValue;double trapezoidal:getAear() constcout<<"trapezoidal類的getAear函數(shù)，面積是"return c * d/2 + c * e/2;void trapezoidal:getAear() constcout<<"hight is&

8、quot;<<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

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

10、;<"請輸入圓心的坐標和圓的半徑："cin>>xx>>yy>>rr;*ptr=new circle(xx,yy,rr);break;case'r':int aa,bb;cout<<"請輸入矩形的長和寬："cin>>aa>>bb;*ptr=new rectangle(aa,bb);break;case't':int hh,ww;cout<<"請輸入三角形的高和底："cin>>hh>>ww;*ptr=new triangle(hh,ww);break;case'c':int cc,dd,ee;cout<<"請輸入梯形的高和上底和下底："cin>>cc>>dd>>ee;*ptr=new trapezoidal(cc,dd,ee);break;default:cout<<"類型錯誤請重新選擇n"while(*pt