Answer to Question #248118 in C++ for Julian

Question

Create a base class called Shape with two data members of double type

which could be used to compute the area of figures. Derive two specific

classes called Triangle and Rectangle from the base class Shape. Add to the

base class, a member function called GetData to initialize base class data

members and another member function displayArea to compute and display

the area of figures. Make displayArea a virtual function and redefine this

function in the derived classes to suit their requirements. Using these three

classes design a program which will accept dimensions of a triangle or

rectangle interactively and display the area.

Answer 1

#include<iostream>
using namespace std;
class Shape
{
	public: 
	double first,second;
		void getData ()
		{
			cin>>first>>second;
		}
		virtual void displayArea () = 0;
};


class Triangle:public Shape
{
	public: void displayArea ()
	{
		cout<<"The area of Triangle:  "<<0.5*first*second<<endl;
	}
};


class Rectangle:public Shape
{
	public:
	 void displayArea ()
	{
		cout<<"The area of the Rectangle:  "<<first*second<<endl;
	}
};


int main()
{	
	Triangle triangle;
	Shape *shape_triangle = &triangle;
	cout<<"Enter base and height: ";
	shape_triangle->getData();
	shape_triangle->displayArea();
	
	Rectangle rec;
	Shape *shape_rect = &rec;
	cout<<"Enter length and width: ";
	shape_rect->getData();
	shape_rect->displayArea();
	return 0;	
}