c++ program for calculate area using inheritance

/* program for calculate area using inheritance*/
#include<iostream.h>
#include<conio.h>
class circle
{
int c,r;
public:
void get()
{
cout<<"\n enter r:";
cin>>r;
c=2*3.14*r*r;
cout<<"area of circul is: "<<c;
}
};
class rectangle
{
int ra,h,w;
public:
void getr()
{
cout<<"\n enter hight:";
cin>>h;
cout<<"\n enter width:";
cin>>w;
ra=h*w;
cout<<"\narea of rectangle is: "<<ra;
}
};
class squre
{
int sa,l;
public:
void getsq()
{
cout<<"\n enter n:";
cin>>l;
sa=l*l;
cout<<"\n area of squre:"<<sa;
}
};
class area:public circle,public rectangle,public squre
{
};
int main()
{
clrscr();
area a;
a.get();
a.getr();
a.getsq();
getch();
return 0;
}