OJ13

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/*
* 程序的版权和版本声明部分
* Copyright (c)2013, 烟台大学计算机学院学生
* All rightsreserved.
* 文件名称：.cpp
* 作者:刘晓晓
* 完成日期：2013 年5月27日
* 版本号： v1.0
* 对任务及求解方法的描述部分：略
* 输入描述：略
* 问题描述：略
*/#include <iostream>
#include <iomanip>
using namespace std;
const double PI =3.1415926;
class Shape
{
public:
    virtual double area() const=0;//纯虚函数
};
class Circle:public Shape
{
public:
    Circle(double r1):r(r1) {} //结构函数
    virtual double area() const
    {
        return PI*r*r;
    };   //定义虚函数
protected:
    double r;

};
class Triangle:public Shape
{
public:
    Triangle(double w,double h):width(w),height(h) {}
    virtual double area() const
    {
        return (width*height)/2;
    }
protected:
    double width,height;
};
class Rectangle:public Shape
{
public:
    Rectangle(double w,double h ):width(w),height(h) {}
    virtual double area() const
    {
        return (width*height);
    }
protected:
    double width,height;
};
class Square :public Shape
{
public :
Square(double l):length(l){}
virtual double area()const
{

return (length*length);

}

protected:
double length;

};
class Trapezoid:public Shape
{
public :
Trapezoid(double h,double l1,double l2):height(h),length1(l1),length2(l2){}
virtual double area()const
{
return (length1+length2)*height/2;

}
private:
double height ,length1,length2 ;

};
int main()

{

float r,a,b,w1,w2,w,h;

cout<<fixed<<setprecision(2);

cin>>r;

Circle circle(r);

cin>>a;

Square square(a);

cin>>a>>b;

Rectangle rectangle(a,b);

cin>>w1>>w2>>h;

Trapezoid trapezoid(w1,w1,h);

cin>>w>>h;

Triangle triangle(w,h);

Shape *pt[5]= {&circle,&square,&rectangle,&trapezoid,&triangle};

double areas=0.0;

for(int i=0; i<5; i++)

areas=areas+pt[i]->area();

cout<<"total of all areas="<<areas<<endl;

return 0;

}

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