06. Area of Figures

package CodnitionalStatements;

import java.util.Scanner;

public class AreaOfFigures_06 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        //тип на фигура
        String type = scanner.nextLine();
        //square, rectangle, circle, triangle
        double area = 0; //лицето на фигурата
        if (type.equals("square")) {
            double a = Double.parseDouble(scanner.nextLine());
            area = a * a;
        } else if (type.equals("rectangle")) {
            double a = Double.parseDouble(scanner.nextLine());
            double b = Double.parseDouble(scanner.nextLine());
            area = a * b;
        } else if (type.equals("circle")) {
            double r = Double.parseDouble(scanner.nextLine());
            area = Math.PI * r * r;
        } else if (type.equals("triangle")) {
            double a = Double.parseDouble(scanner.nextLine());
            double h = Double.parseDouble(scanner.nextLine());
            area = a * h / 2;
        }

        System.out.printf("%.3f", area);
    }
}