Java client/server calculator not working
<p>I'm trying to create a simple calculator using sockets but when I send numbers to the server I have a problem: for example if I want to add 2 numbers x=13 and y=2 the server receives x=64 and y=42 and the result is 106. I think that the problem is with the method write, I have no problem with strings but with numbers I dont know how to work. I'm a beginner, thanks for the help.</p>

<p>SERVER</p>

<pre><code>    package calcolatrice;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    ServerSocket server;
    Socket msocket;
    BufferedReader in;
    DataOutputStream out;
    public Socket attendi() {
        try {
            //creo il server sulla porta ****
            System.out.println("Server in esecuzione..");
            server = new ServerSocket(1122);

            //accetto eventuale connessione da parte del client
            msocket = server.accept();
            System.out.println("Client connesso con successo! ");

            //chiudo la connessione per evitare altre connessioni
            server.close();

            //inizializzo gli stream per consentire la comunicazione
            out = new DataOutputStream(msocket.getOutputStream());
            in = new BufferedReader(new InputStreamReader(msocket.getInputStream()));

        } catch (IOException e) {
            System.out.println(e.getMessage());
            System.out.println("Errore durante l'istanza del server");
            System.exit(1);
        }
        return msocket;
    }


    public void calcola(){
        try{
            double x;
            double y;
            double risultato=0;
            //leggo la scelta e in base a quella eseguo le operazioni
            int scelta = in.read();

            //accetto prima i numeri
            x = in.read();

            System.out.println("x "+x);
            y = in.read();
            System.out.println("y "+y);

            switch (scelta){
                case 1:
                    System.out.println("Scelta: "+scelta);
                    //somma
                    risultato = x+y;


            }
            System.out.println("Risultato: "+risultato);

        }catch (Exception e){

        }
    }


    public static void main(String args[]) {
        Server myServer = new Server();
        myServer.attendi();
        myServer.calcola();
    }
}
</code></pre>

<p>CLIENT</p>

<pre><code>    package calcolatrice;

import java.io.*;
import java.net.Socket;
import java.util.Scanner;

public class Client{
    Socket socket;
    protected int porta = 1122;
    String nomeServer = "localhost";
    //stream per comunicare
    DataOutputStream out;
    BufferedReader in;


    Scanner input = new Scanner(System.in);

    public Socket connetti(){
        try {
            System.out.println("Client avviato..");
            //creo il socket per connettermi al server
            socket = new Socket(nomeServer, porta);
            System.out.println("Client connesso con successo al server ' "+nomeServer+" ' sulla porta: "+porta);
            //inizializzo gli stream per consentire la comunicazione
            out = new DataOutputStream(socket.getOutputStream());
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        } catch (Exception e){
            System.out.println("Errore, impossibile connettersi");
            System.exit(1);
        }
        return socket;

    }

    //menu per scelta operazioni
    private void menu(){
        try{
            System.out.println("---Calcolatrice---");
            System.out.println("[1.Somma \t 2.Differenza \t 3.Moltiplicazione \t 4.Divisione]");
            System.out.println("0.ESCI");
        } catch (Exception e){
            System.out.println("Errore");
        }


    }

    //funzione per comunicare
    public void comunica(){
        try {
            int scelta=0;
            //do{
                menu();
                System.out.println("Inserire operazione ");
                scelta = input.nextInt();
                //invio la scelta al server
                //out.writeByte(scelta);
                out.write(scelta);

                //Inserisco i numeri e li spedisco al server
                System.out.println("Inserisci primo numero.");
                double x = input.nextDouble();
                out.writeDouble(x);

                System.out.println("Inserisci secondo numero.");
                double y = input.nextDouble();
                out.writeDouble(y);

            //}
            //while(scelta != 0);
        }catch (IOException e){

        }


    }

    public static void main(String args[]){
        Client myClient = new Client();
        myClient.connetti();
        myClient.comunica();


    }
}
</code></pre>