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abstractbaseclass.cpp
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abstractbaseclass.cpp
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#include <bits/stdc++.h>
using namespace std;
class Shape
{
public:
virtual float area() const {return 0;}
virtual float volume() const {return 0;}
virtual void shapeName() const=0;
};
class Point:public Shape
{
public:
Point(float a=0,float b=0):x(a),y(b){};
void setPoint(float,float);
float getX()const{return x;}
float getY()const{return y;}
virtual void shapeName() const
{
cout<<"Point:";
}
friend ostream & operator << (ostream&,const Point &);
protected:
float x,y;
};
void Point::setPoint(float a,float b)
{
x=a;
y=b;
}
ostream & operator <<(ostream &output,const Point &p)
{
output<<"["<<p.x<<","<<p.y<<"]";
return output;
}
class Circle:public Point
{
public:
Circle(float a=0,float b=0,float r=0):Point(a,b),radius(r){};
void setRadius(float);
float getRadius() const;
float area() const;
virtual void shapeName() const{cout<<"Circle:";}
friend ostream &operator << (ostream&,const Circle &);
protected:
float radius;
};
void Circle::setRadius(float r)
{
radius=r;
}
float Circle::getRadius() const
{
return radius;
}
float Circle::area() const
{
return 3.14159*radius*radius;
}
ostream &operator << (ostream & output,const Circle &c)
{
output<<"["<<c.x<<","<<c.y<<"],r="<<c.radius;
return output;
}
class Cylinder:public Circle
{
public:
Cylinder(float a=0,float b=0,float r=0,float h=0):Circle(a,b,r),height(h){}
void setHeight(float h){height=h;}
virtual float area() const{ return 2*Circle::area()+2*3.14159*radius*height;}
virtual float volume() const {return Circle::area()*height;}
virtual void shapeName() const {cout<<"Cylinder:";}
friend ostream & operator << (ostream &, Cylinder &);
protected:
float height;
};
ostream &operator <<(ostream& output,Cylinder& c)
{
output<<"["<<c.x<<","<<c.y<<"],r="<<c.radius<<",h="<<c.height;
return output;
}
int main()
{
Cylinder cy(3.5,6.4,5.2,10.5);
Point p(3.2,4.5);
Circle c(2.4,1.2,5.6);
p.shapeName();
cout<<p<<endl;
c.shapeName();
cout<<c<<endl;
cy.shapeName();
cout<<cy<<endl<<endl;
Shape *pt;
pt=&cy;
pt->shapeName();
cout<<pt->volume();
}