import java.util.*;

/******************************************************************************
* Author: Junaid
* Date: 17/9/19
* Purpose: Shape Calculator
******************************************************************************/
public class ShapeCalculator
{
    public static void main( String [] args)
    {
    	Scanner sc = new Scanner(System.in);
    	char userSelection;

		System.out.println("Make a selection");
		System.out.println("Type 'c' for area of circle");
		System.out.println("Type 'r' for area of rectangle");
		System.out.println("Type 't' for area of triangle");
		System.out.println("Type 'e' to exit");

		userSelection= sc.next().charAt(0);

		switch(userSelection)
		{

			case 'c':
				int diameter; int meters; int cm;
				double area; double mm; double length; double width; double base; double height; double radius;
				System.out.println("Please enter the diameter of the circle in cm");
				diameter = sc.nextInt();
				radius = (double)diameter/2;
				area = Math.PI*radius*radius;
				meters = (int)area/10000;
				cm = (int)area%10000;
				mm = (int)(area*10000%10000);
				mm = mm/100;
				System.out.println("The area of the circle is "+meters+"m^2, "+cm+"cm^2, "+mm+"mm^2.");
			break;

			case 'r':
				System.out.println("Please Enter the length of the rectangle in cm");
				length = sc.nextDouble();
				System.out.println("Please Enter the width of the rectangle in cm");
				width = sc.nextDouble();
				area = length*width;
				meters = (int)area/10000;
				cm = (int)area%10000;
				mm = (int)(area*10000%10000);
				mm = mm/100;
				System.out.println("The area of the rectangle is "+meters+"m^2, "+cm+"cm^2, "+mm+"mm^2.");
			break;

			case  't':
				System.out.println("Please enter the base of the triangle in mm");
				base = sc.nextDouble();
				System.out.println("Please enter the height of the triangle in mm");
				height = sc.nextDouble();
				area = 0.5*base*height;
				meters = (int)area/1000000;
				cm = (int)area/100%10000;
				mm = (int)((area*10)%1000);
				mm = mm/10;
				System.out.println("The area of the trianle is "+meters+"m^2, "+cm+"cm^2, "+mm+"mm^2.");
			break;

			case  'e':
				System.out.println("ADIOS");
			break;

			default:
				System.out.println("Please type in a correct option");
			break;
		}

    }
}