07. Area of Figures

package conditionalStatementsLab;

import java.util.Scanner;

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

        String typeFigure = scanner.nextLine();

        double area = 0;
        if (typeFigure.equals("square")) {
            double a = Double.parseDouble(scanner.nextLine());
            area = a * a;

        } else if (typeFigure.equals("rectangle")) {
            double a = Double.parseDouble(scanner.nextLine());
            double b = Double.parseDouble(scanner.nextLine());

            area = a * b;

        } else if (typeFigure.equals("circle")) {
            double r = Double.parseDouble(scanner.nextLine());
            area = Math.PI * r * r;

        } else if (typeFigure.equals("triangle")) {
            double a = Double.parseDouble(scanner.nextLine());
            double ha = Double.parseDouble(scanner.nextLine());
            area = (a * ha) / 2;
        }

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