Addition In Calculator Application

Question

Hi everyone,
I've got a bit of a problem. I'm busy working on a calculator that will be used in DOS. Eventually it will include the arithmetic operations as well as 5 scientific operations and convert to octal and hexadecimal. I�ve included my code below, it compiles perfectly but now I need to know how to get it to accept numbers that can be stored in an array so that it can for instance add them but then return to the menu to accept the next calculation.
Thanks for any help you may have.
Patrick.
import java.io.*;
import java.util.Date;
import java.text.SimpleDateFormat;
class Calc {
     Calc(String username){
          Date today = new Date();
          SimpleDateFormat time = new SimpleDateFormat("E MMM d yyyy");
          String time2 = time.format(today);
          System.out.println("Welcome " + username + " todays date is " + time2);
          menu();     
     String getInput() {
          String temp = "";
          try {           
               BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
               temp = buff.readLine();
                      } catch (Exception e) {
                         System.out.println("Caught Exception: " + e);
          return temp;
     void menu() {
          String temp = "";
             do{
               System.out.println("\nTo add use +");
               System.out.println("To subtract use -");
               System.out.println("To divide use /");
               System.out.println("To multiply use M");
               temp = getInput();
               if (temp.equals("+") ) {
                    System.out.println("Please enter the numbers you want to add");
                    addition();
          } while (temp.compareToIgnoreCase("exit") != 0);     
     void addition() {
          System.out.println("This is the addition method");
     public static void main(String[] args) {
          if (args.length == 0) {
               System.out.println("Please enter your name and surname at the command prompt...");
               System.exit(0);
          } else {
               Calc Pro = new Calc(args[0]);
}

Answer 1

Can't you do something like this:
try
     int ch;
     while ((ch = System.in.read ()) != '\n')
         // do something here
          System.out.print ((char) ch);
catch (Exception e)
     System.out.println(e);
}