import java.util.*;
public class AreaCalculator{
    public static void main(String[] args){
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Shape Area Calculator version 0.1 (c) 2005 Mitchell Sample Output, Inc.");

        while(true){
            System.out.println();
            System.out.println("-=-=-=-=-=-=-=-=-=-=-=-=-=-=-");
            System.out.println();
            System.out.println("1) Triangle");
            System.out.println("2) Rectangle");
            System.out.println("3) Square");
            System.out.println("4) Circle");
            System.out.println("5) Quit");
            System.out.print("Which shape: ");
            int shape = keyboard.nextInt();
            System.out.println();

            if(shape == 1){
                area_triangle(5,6);
            }else if(shape == 2){
                area_rectangle(4,5);
            }else if(shape == 3){
                area_square(4);
            }else if(shape == 4){
                area_circle(4);
            }else if(shape == 5){
                quit();
                break;
            }
        }}
    public static double area_triangle(int base, int height){
        Scanner keyboard = new Scanner(System.in);
        System.out.print("Base: ");
        base = keyboard.nextInt();
        System.out.print("Height: ");
        height = keyboard.nextInt();
        System.out.println();
        int A=(base*height)/2;
        System.out.println("The area is "+A+".");
        return A;
    }
    public static int area_rectangle(int length, int width){
        Scanner keyboard = new Scanner(System.in);
        System.out.print("Length: ");
        length = keyboard.nextInt();
        System.out.print("Width: ");
        width = keyboard.nextInt();
        System.out.println();
        int A=length*width;
        System.out.println("The area is "+A+".");
        return A;
    }
    public static int area_square(int side){
        Scanner keyboard = new Scanner(System.in);
        System.out.print("Side: ");
        side = keyboard.nextInt();
        System.out.println();
        int A=side*side;
        System.out.println("The area is "+A+".");
        return A;
    }public static double area_circle(int radius){
        Scanner keyboard = new Scanner(System.in);
        System.out.print("Radius: ");
        radius = keyboard.nextInt();
        System.out.println();
        double A=Math.PI*radius*radius;
        System.out.println("The area is "+A+".");
        return A;
    }
    public static String quit(){
        System.out.println("GoodBye");
        return null;
    }
}