////1
package com.company;
import java.util.Scanner;



public class Main {

    static float root3(float x) {
        float y1 = x / 3;
        float y0 = 0;
        while (Math.abs(y0 - y1) > 1.0E-5) {
            y0 = y1;
            y1 = (2 * y0 + x / (y0 * y0)) / 3;
        }
        return y1;
    }

    public static void main(String[] arg) {
        Out.print("Zahl eingeben");
        float x;
        Scanner scan = new Scanner( System.in );
        x = scan.nextFloat();
            Out.println("Kubikwurzel von " + x + " ist " + root3(x));
        }
    }
////2
package com.company;
import java.util.Scanner;

public class Aufgabe_2 {

    static double area(double a, double b, double c){

        double s = a + b + c / 2;
        return Math.sqrt(s * (s - a) * (s - b) * (s - c));
    }

    public static void main(String[] arg) {

        System.out.println("a:");
        double a;
        Scanner scan = new Scanner( System.in );
        a = scan.nextDouble();

        System.out.println("b:");
        double b;
        b = scan.nextDouble();

        System.out.println("c:");
        double c;
        c = scan.nextDouble();
        System.out.println("Die Fläche ist: " + area(a, b, c));
    }
}
////3

package com.company;
import java.util.Scanner;

public class Aufhabe_3 {

    public static void main(String args[]){


        String binärzahl;
        Scanner sc = new Scanner(System.in);
        System.out.println("Gib eine Binärzahl ein ");
        binärzahl = sc.nextLine();

        int decimal=Integer.parseInt(binärzahl,2);
        System.out.println(decimal);

    }


    }