2014-第14周项目二-OJ版

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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 (0.5*width*height);    }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);}private:double length;};class Trapezoid:public Shape{public :    Trapezoid(double a,double b,double h):a1(a),b1(b),height(h){}    virtual double area()  const    {    return ((a1+b1)*height*0.5);    }    private:    double a1,b1,height;};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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