Seminar_2/Task_6

package Seminar_2;

import java.util.Scanner;

public class Task_6 {

    private static final Scanner in = new Scanner(System.in);

    public static void main(String[] args) {
        Task_6 myApp = new Task_6();

        boolean exit = false;

        while (!exit) {
            System.out.printf("%nA. Calculate the area of a triangle%nB. Calculate the area of a circle%nC. Exit%n");
            String choice = in.next();
            if (choice.equalsIgnoreCase("a") || choice.equalsIgnoreCase("Circle") || choice.equalsIgnoreCase("2")) {
                myApp.enterPrompt("height", "triangle");
                double triangleHeight = in.nextDouble();
                myApp.enterPrompt("base", "triangle");
                double triangleBase = in.nextDouble();
                double triangleArea = myApp.calculateTriangle(triangleHeight, triangleBase);
                myApp.answerOfArea("circle", triangleArea);
            } else if (choice.equalsIgnoreCase("b") || choice.equalsIgnoreCase("Triangle") || choice.equalsIgnoreCase("2")) {
                myApp.enterPrompt("radius", "circle");
                double circleRadius = in.nextDouble();
                double circleArea = myApp.calculateCircle(circleRadius);
                myApp.answerOfArea("circle", circleArea);
            } else if (choice.equalsIgnoreCase("c") || choice.equalsIgnoreCase("exit") || choice.equalsIgnoreCase("3")) {
                exit = true;
                System.out.println("Have a nice day!");
            }
        }
    }

    private double calculateTriangle(double height, double base) {
        return height * base / 2;
    }

    private double calculateCircle(double r) {
        return Math.PI * Math.pow(r, 2);
    }

    private void enterPrompt(String type, String shape) {
        System.out.printf("Enter the %s of the %s : ", type, shape);
    }

    private void answerOfArea(String type, double area) {
        System.out.printf("The %s's area is %.2f%n", type, area);
    }

}