#include<iostream>
using namespace std;
#include<conio.h>
class area_cl
{
public:
double height;
double width;
};
class rectangle : public area_cl
{
public:
rectangle(double h,double w){height=h;width=w;}
double area(){return height*width;}
};
class isosceles : public area_cl
{
public:
isosceles(double h,double w){height=h;width=w;}
double area(){return 0.5*height*width;}
};
class cylinder : public area_cl
{
public:
float r;
cylinder(double h,float x){height=h;r=x;}
double area(){return 2*3.141569*r*r + 2*3.141569*r*height;}
};
int main()
{
cout<<“Calculate the area\n=====================\n\n\n”;
float r;
cout<<“\nEnter Radius = “;
cin>>r;
double h,w;
cout<<“\nEnter Height = “;
cin>>h;
cout<<“\nEnter Width = “;
cin>>w;
rectangle ob1(h,w);
isosceles ob2(h,w);
cylinder ob3(h,r);
cout<<“\n\n\nArea of rectangle = “<<ob1.area();
cout<<“\nArea of isosceles = “<<ob2.area();
cout<<“\nArea of cylinder = “<<ob3.area();
}
