07. Area of Figures

package conditionalStatements;

import java.util.Scanner;

public class P07AreaOfFigures {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String type = scanner.nextLine();

        //квадрат (square), правоъгълник (rectangle), кръг (circle) и триъгълник (triangle)

        double area = 0;
        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);
    }
}