// Online C++ compiler to run C++ program online
#include <iostream>
using namespace std;

class shape
{
   public:
   int area;
   virtual void calculatearea() = 0;
   virtual void printarea() = 0;
};

class Rectangle : public shape
{
     public:
    int len;
    int breadth;
   
    Rectangle(int l, int b) : len(l),breadth(b) {}
    
    void calculatearea()
    {
        area = len*breadth;
    }
    
    void printarea()
    {
        cout<<"Area of Rectangle : "<<area<<endl;
    }

};

class Square : public Rectangle
{
    public:
    
    Square(int val) : Rectangle(val,val) {}

    void calculatearea()
    {
        area = len*breadth;
    }
    
    void printarea()
    {
        cout<<"Area of Square : "<<area<<endl;
    }
    
    
};

class Triangle : public shape
{
   public:
   int base;
   int height;

   Triangle(int b, int h) : base(b),height(h) {}
   
    void calculatearea()
    {
        area = 0.5 * base * height;
    }
    
    void printarea()
    {
        cout<<"Area of Triangle : "<<area<<endl;
    }
   
    
};



int main() {
    // Write C++ code here
    int len,brth,side,base,height;
    cout<<"enter the length : "<<endl;
    cin>>len;
    cout<<"enter the breadth : "<<endl;
    cin>>brth;
    shape *R = new Rectangle(len,brth);
    R->calculatearea();
    R->printarea();
    
    cout<<"enter the side : "<<endl;
    cin>>side;
    shape *S = new Square(side);
    S->calculatearea();
    S->printarea();
    
    cout<<"enter the base : "<<endl;
    cin>>base;
    cout<<"enter the height : "<<endl;
    cin>>height;
    shape *T = new Triangle(base,height);
    T->calculatearea();
    T->printarea();
    
    

    return 0;
}