Area_exp

import java.util.Scanner;
import java.lang.Math;
public class Area_exp{
    public static void main(String Args[])
    {
        Scanner sc = new Scanner(System.in);
        Area ar = new Area();
        int a,b,c;
        while(true)
        {
            System.out.print("\n\n1. Circle\n2. Rectangle\n3. Triangle\n4. Exit\n Enter your choice: ");
            int ch = sc.nextInt();
            switch(ch)
            {
                case 1:
                System.out.print("Enter a : ");
                a = sc.nextInt();
                System.out.println(ar.Area(a));
                break;

                case 2:
                System.out.print("Enter a : ");
                a = sc.nextInt();
                System.out.print("Enter b : ");
                b = sc.nextInt();
                System.out.println(ar.Area(a,b));
                break;

                case 3:
                System.out.print("Enter a : ");
                a = sc.nextInt();
                System.out.print("Enter b : ");
                b = sc.nextInt();
                System.out.print("Enter c : ");
                c = sc.nextInt();
                System.out.println(ar.Area(a,b,c));
                break;

                case 4:
                System.exit(0);
            }
        }
    }
}

class Area {
    int a;
    int b;
    int c;

    Area()
    {
        System.out.print("\tDefault Const called!\n");
        a = 0;
        b = 0;
        c = 0;
    }
    void Area()
    {
        System.out.print("\t exp\n");
    }

    Area(int a, int b, int c)
    {
        System.out.print("\tParameterized Const called!\n");
        this.a=a;
        this.b=b;
        this.c=c;
    }


    double Area(int a)
    {
        System.out.println("Area of Circle");
        double pi = 3.14;
        return a*a*pi;
    }

    double Area(int a, int b)
    {
        System.out.println("Area of Rectangle");
        return (double)(a*b);
    }

    double Area(int a, int b, int c)
    {
        System.out.println("Area of Triangle");
        double s = (a+b+c)/2;
        double area = Math.sqrt(s*(s-a)*(s-b)*(s-c));
        return area;
    }



}