第六章第6题
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#include <iostream>
using namespace std;
class Shape
{public:
virtual double area() const =0;
};
class Circle:public Shape
{public:
Circle(double r):radius(r){}
virtual double area() const {return 3.14159*radius*radius;};
protected:
double radius;
};
class Square:public Shape
{public:
Square(double s):side(s){}
virtual double area() const {return side*side;}
protected:
double side;
};
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 Trapezoid:public Shape
{public:
Trapezoid(double t,double b,double h):top(t),bottom(b),height(h){}
virtual double area() const {return 0.5*(top+bottom)*height;}
protected:
double top,bottom,height;
};
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;
};
int main()
{
Circle circle(9.8);
Square square(4.2);
Rectangle rectangle(3.1,8.4);
Trapezoid trapezoid(2.0,4.5,3.2);
Triangle triangle(4.5,8.4);
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<<"总面积="<<areas<<endl;
return 0;
}
using namespace std;
class Shape
{public:
virtual double area() const =0;
};
class Circle:public Shape
{public:
Circle(double r):radius(r){}
virtual double area() const {return 3.14159*radius*radius;};
protected:
double radius;
};
class Square:public Shape
{public:
Square(double s):side(s){}
virtual double area() const {return side*side;}
protected:
double side;
};
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 Trapezoid:public Shape
{public:
Trapezoid(double t,double b,double h):top(t),bottom(b),height(h){}
virtual double area() const {return 0.5*(top+bottom)*height;}
protected:
double top,bottom,height;
};
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;
};
int main()
{
Circle circle(9.8);
Square square(4.2);
Rectangle rectangle(3.1,8.4);
Trapezoid trapezoid(2.0,4.5,3.2);
Triangle triangle(4.5,8.4);
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<<"总面积="<<areas<<endl;
return 0;
}
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