Develop a simple calculator with addition, subtraction, multiplication and division capabilities, data collection from client side, executed on server

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                    IDL
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module CalcApp
{
    interface Calc
    {
        float add(in float value1,in float value2);
        float sub(in float value1,in float value2);
        float multi(in float value1,in float value2);
        float div(in float value1,in float value2);
        oneway void shutdown();
    };

};

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                    Server
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import CalcApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import org.omg.PortableServer.*;
import org.omg.PortableServer.POA;

import java.util.Properties;

class CalcImpl extends CalcPOA 
{
    private ORB orb;

    public void setORB(ORB orb_val) 
    {
        orb = orb_val; 
    }
    public float add(float val1, float val2)
    {
        float res = val1 + val2;
        return res;
    }
    public float sub(float val1, float val2)
    {
        float res = val1 - val2;
        return res;
    }
    public float multi(float val1, float val2)
    {
        float res = val1 * val2;
        return res;
    }
    public float div(float val1, float val2)
    {
        float res = val1 / val2;
        return res;
    }
    public void shutdown() 
    {
        orb.shutdown(false);
    }
}


public class CalcServer 
{

    public static void main(String args[]) 
    {
        try
        {

              ORB orb = ORB.init(args, null);


              POA rootpoa = POAHelper.narrow(orb.resolve_initial_references(\"RootPOA\"));
              rootpoa.the_POAManager().activate();
              CalcImpl calcImpl = new CalcImpl();
              calcImpl.setORB(orb); 
              org.omg.CORBA.Object ref = rootpoa.servant_to_reference(calcImpl);
              Calc href = CalcHelper.narrow(ref);
              org.omg.CORBA.Object objRef =
              orb.resolve_initial_references(\"NameService\");
              NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
              String name = \"Calc\";
              NameComponent path[] = ncRef.to_name( name );
              ncRef.rebind(path, href);

              System.out.println(\"CalculatorServer ready and waiting ...\");

              orb.run();
        } 

        catch (Exception e) 
        {
            System.err.println(\"ERROR: \" + e);
            e.printStackTrace(System.out);
        }

        System.out.println(\"CalculatorServer Exiting ...\");
      }
}

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                    Client
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import CalcApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import java.io.*;

public class CalcClient
{
    public void showMenu()
    {
        System.out.println(\"----------------------------------\");
        System.out.println(\"0.Exit\");
        System.out.println(\"1.Addition\");
        System.out.println(\"2.Subtraction\");
        System.out.println(\"3.Multiplicatin\");
        System.out.println(\"4.Division\");
        System.out.println(\"----------------------------------\");
        System.out.print(\"Enter your choice : \");

    }
    public float getValue() throws IOException
    {
        float val=0;
        try
        {
            System.out.print(\"Enter the value : \");
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            String s = br.readLine();
            val = Float.parseFloat(s);
        }
        catch (IOException e)
        {
            System.out.println(e);
        }
        return val;
    }
    public int getChoice() throws IOException
    {
        int val=0;
        try
        {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            val = Integer.parseInt(br.readLine());
            System.out.println(\"----------------------------------\");
        }
        catch (IOException e)
        {
            System.out.println(e);
        }
        return val;
    }



    public static void main(String args[])
    {

        Calc calcImpl = null;
        CalcClient cc = new CalcClient();

        try
        {

            ORB orb = ORB.init(args, null);
                org.omg.CORBA.Object objRef = orb.resolve_initial_references(\"NameService\");
            NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
                 String name = \"Calc\";
            calcImpl = CalcHelper.narrow(ncRef.resolve_str(name));
            float val1 = 0;
            float val2 = 0;
            float res = 0;
            int ch = 1;

            while (ch != 0 )
            {
                cc.showMenu();
                ch = cc.getChoice();

                val1 = cc.getValue();
                val2 = cc.getValue();

                switch (ch)
                {
                    case 1:
                        res = calcImpl.add(val1, val2);
                        break;
                    case 2:
                        res = calcImpl.sub(val1, val2);
                        break;
                    case 3:
                        res = calcImpl.multi(val1, val2);
                        break;
                    case 4:
                        res = calcImpl.div(val1, val2);
                        break;
                    case 0:
                        exit(0);
                }
                System.out.println(\"----------------------------------\");
                System.out.println(\"Result : \"+res);
                System.out.println(\"----------------------------------\");
            }

                calcImpl.shutdown();
        }
        catch (Exception e) 
        {
            System.out.println(\"ERROR : \" + e) ;
            e.printStackTrace(System.out);
        }
    }

}

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                    Output
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----------------------------------
0.Exit
1.Addition
2.Subtraction
3.Multiplicatin
4.Division
----------------------------------
Enter your choice : 2
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Enter the value : 20.5
Enter the value : 10.2
----------------------------------
Result : 10.3
----------------------------------
----------------------------------
0.Exit
1.Addition
2.Subtraction
3.Multiplicatin
4.Division
----------------------------------
Enter your choice : 0