domashno pravougulnik

package nina;

import java.util.Scanner;

public class gbr {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double a = scan.nextDouble();
        System.out.println("a:"+a);
        double b = scan.nextDouble();
        System.out.println("b:"+b);
        double P = 2*(a+b);
        double S = a*b;
        System.out.println("P="+P);
        System.out.println("S="+S);

    }
}