// calc.idl

module calc_val
{
  interface calc
  {
    double addfn(indouble a,indouble b);
    double subfn(indouble a,indouble b);
    double mulfn(indouble a,indouble b);
    double divfn(indouble a,indouble b);
  };
};


// calc_client.java    
    
import calc_val.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import java.io.*;
publicclass calc_client
{
    static calc calcimpl;
    publicstaticvoid main(String args[])
    {
      try
      {
        double result=0.0,num1=0.0,num2=0.0;

        ORB orb=ORB.init(args,null);
        org.omg.CORBA.Object objref=orb.resolve_initial_references("NameService");

        NamingContextExt ncref=NamingContextExtHelper.narrow(objref);

        String pathname="calc";
        calcimpl=calcHelper.narrow(ncref.resolve_str(pathname));


       int ch=1;

       while(ch!=0)
       {
        System.out.println("1. Addition");
        System.out.println("2. Subtraction");
        System.out.println("3. Multiplication");
        System.out.println("4. Division");
        System.out.println("0. Exit");

        BufferedReader in1=new BufferedReader(new InputStreamReader(System.in));

        System.out.println("enter your choice:");
        ch=Integer.parseInt(in1.readLine());
        
        if(ch==0)
          break;

        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));

        System.out.println("enter number1:");
        num1=Double.parseDouble(in.readLine());

        System.out.println("enter number2:");
        num2=Double.parseDouble(in.readLine());

        switch(ch)
        {
          case 1:
              result=calcimpl.addfn(num1,num2);
              break;

          case 2:
              result=calcimpl.subfn(num1,num2);
              break;

          case 3:
              result=calcimpl.mulfn(num1,num2);
              break;

          case 4:
              result=calcimpl.divfn(num1,num2);
              break;

        }
              System.out.println("result is:"+result);

        }

      }
      catch(Exception e)
      {
         System.out.println(e);
      }
    }

}

            -----------------                
            calc_server.java
            -----------------

import calc_val.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import org.omg.PortableServer.*;
import org.omg.PortableServer.POA;

class serverimpl extends calcPOA
{
   private ORB orb;
   publicvoid setorb(ORB orb_val)
   {
      orb=orb_val;
   }

   publicdouble addfn(double n1,double n2)
   {
     return(n1+n2);
   }
   publicdouble subfn(double n1,double n2)
   {
     return(n1-n2);
   }
   publicdouble mulfn(double n1,double n2)
   {
     return(n1*n2);
   }
   publicdouble divfn(double n1,double n2)
   {
     return(n1/n2);
   }


}
publicclass calc_server
{
   publicstaticvoid main(String args[])
   {
     try
     {
         ORB orb=ORB.init(args,null);

         org.omg.CORBA.Object objref1=orb.resolve_initial_references("RootPOA");
         POA rootpoa=POAHelper.narrow(objref1);
         rootpoa.the_POAManager().activate();


         serverimpl serverobj=new serverimpl();
         serverobj.setorb(orb);
         org.omg.CORBA.Object objref2=rootpoa.servant_to_reference(serverobj);
         calc href=calcHelper.narrow(objref2);


         org.omg.CORBA.Object objref3= orb.resolve_initial_references("NameService");
         NamingContextExt ncref=NamingContextExtHelper.narrow(objref3);
         String pathname="calc";
         NameComponent path[]=ncref.to_name(pathname);
         ncref.rebind(path,href);


         System.out.println("server ready and waiting...");

         orb.run();


     }
     catch(Exception e)
     {
       System.out.println(e);
     }
   }


}

************* OUTPUT *************
E:\DIPI1\corba prgs\calculator>java calc_client -ORBInitialPort 1050 -ORBInitial
Host a

1. Addition
2. Subtraction
3. Multiplication
4. Division
0. Exit
enter your choice:
1
enter number1:
12
enter number2:
45
result is:57.0

1. Addition
2. Subtraction
3. Multiplication
4. Division
0. Exit
enter your choice:
2
enter number1:
45
enter number2:
90
result is:-45.0

1. Addition
2. Subtraction
3. Multiplication
4. Division
0. Exit
enter your choice:
3
enter number1:
12
enter number2:
5
result is:60.0

1. Addition
2. Subtraction
3. Multiplication
4. Division
0. Exit
enter your choice:
4
enter number1:
35
enter number2:
2
result is:17.5
1. Addition
2. Subtraction
3. Multiplication
4. Division
0. Exit
enter your choice:
0