Pg2

/*2) Write a program in java to implement the abstract class and override the methods of the
abstract class in the provided derived classes.
Class : Shape2D
Members: type
Abstract methods: area(), perimeter()
Class: Circle (inherits Shape2D)
Members: center, radius
Methods: area(), perimeter(), print()
Class: Triangle (inherits Shape2D)
Members: base, height
Methods: area(), perimeter(), print()

*/

import java.lang.Math;
abstract class Shape2d
{
    String type;	
	abstract double area();
	abstract double perimeter();
	
}
class Circle extends Shape2d
{ double aoc,poc,r;
   Circle(double c)
   {
	   r=c;
   }
	double area()
	{
		aoc=3.14*r*r;
		return aoc;
	}
	 double perimeter()
	{
		poc=2*3.14*r;
		return poc;
	}
	void print()
	{
		System.out.println("area of "+type+" : "+aoc);
		System.out.println("perimeter of "+type+" : "+poc);
	}
	
}
class Triangle extends Shape2d
{double aot,pot,b,p,h;

Triangle(double d,double e)
{
	b=d;
	h=e;
}
	double  area()
	{
		aot=(b*h)/2;
	  return aot;
	}
	double perimeter()
	{
		p=Math.sqrt((b*b)+(h*h));
		pot=b+h+p;
		return pot;
	}
	void print()
	{
		System.out.println("area of "+type+":"+aot);
		System.out.println("perimeter of "+type+" : "+pot);
	}
	
}

public class Pg2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
Circle s=new Circle(5.0);
Triangle t=new Triangle(9.0,9.0);
s.type="circle";

s.area();
s.perimeter();
s.print();
t.type="triangle";
t.area();
t.perimeter();
t.print();
	}

}