第1个回答 推荐于2016-09-06
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 #include <iostream>
using namespace std;
const float PI = (float)3.14159;
class Shape{
public:
virtual float CalCircumference()=0;
virtual float CalArea()=0;
};
//圆形
class Roundness: public Shape{
public:
Roundness(float r):radius(r)
{}
virtual float CalCircumference()
{
return 2 * PI * radius;
}
virtual float CalArea()
{
return PI * radius * radius;
}
private:
float radius;
};
//正方形
class Square: public Shape{
public:
Square(float w):width(w)
{}
virtual float CalCircumference()
{
return 4 * width;
}
virtual float CalArea()
{
return width * width;
}
private:
float width;
};
//长方形
class Rectangle: public Shape{
public:
Rectangle(float w, float h):width(w), hight(h)
{}
virtual float CalCircumference()
{
return 2 * (width + hight);
}
virtual float CalArea()
{
return hight * width;
}
private:
float width;
float hight;
};
void main()
{
Shape* roud = new Roundness(3);
Shape* squ = new Square(3);
Shape* rang = new Rectangle(3, 4);
cout<<"圆形的周长:"<<roud->CalCircumference()<<" 面积:"<<roud->CalArea()<<endl;
cout<<"正方形的周长:"<<squ->CalCircumference()<<" 面积:"<<squ->CalArea()<<endl;
cout<<"长方形的周长:"<<rang->CalCircumference()<<" 面积:"<<rang->CalArea()<<endl;
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