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

----------------------------------------------------------------------------------
                    Server
----------------------------------------------------------------------------------
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;

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


publicclass CalcServer 
{

    publicstaticvoid 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 ...");
      }
}

-------------------------------------------------------------------------------------------------
                    Client
-------------------------------------------------------------------------------------------------

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

publicclass CalcClient
{
    publicvoid 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 : ");
        
    }
    publicfloat 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;
    }
    publicint 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;
    }

  

    publicstaticvoid 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);
        }
    }

}

-------------------------------------------------------------------------------------------------
                    Output
-------------------------------------------------------------------------------------------------

----------------------------------
0.Exit
1.Addition
2.Subtraction
3.Multiplicatin
4.Division
----------------------------------
Enter your choice : 2
----------------------------------
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