C++ code showing Hierarchical Inheritance to calculate Area

This is the solution for T.U.2068 Q.N.3

#include <iostream>

using namespace std;

class Shape
{
protected:
    int A;
public:
    Shape()
    {
        A=0;
    }
    void show();
};

class Triangle:public Shape
{
    int h, b;
public:
    void Geth();
    void Getb();
    void Showhb();
    void CalTriA();
};

class Rectangle:public Shape
{
    int l, b;
public:
    void Getl();
    void Getb();
    void Showlb();
    void CalRecA();
};

void Shape::show()
{
    cout << endl << "Area=" << A << endl ;
}

void Triangle::Geth()
{
    cout << endl << "Enter height of the triangle:" ;
    cin >> h ;
}

void Triangle::Getb()
{
    cout << endl << "Enter base of the triangle:" ;
    cin >> b ;
}

void Triangle::Showhb()
{
    cout << endl << "Triangle:" << endl ;
    cout << "Height=" << h << endl << "Base=" << b << endl ;
}

void Triangle::CalTriA()
{
    A = (h*b)/2;
}

void Rectangle::Getl()
{
    cout << endl << "Enter length of Rectangle:" ;
    cin >> l ;
}

void Rectangle::Getb()
{
    cout << endl << "Enter breadth of Rectangle:" ;
    cin >> b ;
}

void Rectangle::Showlb()
{
    cout << endl << "Rectangle" << endl ;
    cout << "Length=" << l << endl << "Breadth=" << b << endl ;
}

void Rectangle::CalRecA()
{
    A = l*b ;
}


int main()
{
    Triangle T;
    T.Geth();
    T.Getb();
    Rectangle R;
    R.Getl();
    R.Getb();
    T.Showhb();
    T.CalTriA();
    T.show();
    R.Showlb();
    R.CalRecA();
    R.show();
    return 0;
}