// GetNext.java: fetch the next char or int from standard input
//  Uses non-static methods

import java.io.*;
public class GetNext
{
   // in: reader for reading input data
   private Reader in = new InputStreamReader(System.in); 

   // ch: holds the next character read
   private char ch;

   public char getNextChar() {
      try {
         ch = (char)in.read();
      }
      catch (Exception exception) 
      {
         System.out.println("Error reading character");
         ch = ' ';
      }
      return ch;
   }

   public int getNextInt() {
      // ...
      // omitted code
   }
}           

// ConvertBase.java: convert an int n to base b
public class ConvertBase
{
   private char ch; // char location to hold next

   public String convertToBase(int n, int b) {
      String s = new String();
      int r;
      while (n != 0) {
         r = n%b;
         ch = (char)(r + '0');
         s = ch + s;
         n = n/b;
      }
      return s;
   }

   // main function to try out Base class
   public static void main (String[] args) {
      ConvertBase base = new ConvertBase();
      GetNext get = new GetNext();
      int n; // number to convert to base b
      int b; // base for number conversions
      while(true) {
         System.out.print("Number to convert ----->");
         n = get.getNextInt();
         if (n == 0) break;
         System.out.print("Base for conversion --->");
         b = get.getNextInt();
         String conv = new String();
         conv = base.convertToBase(n, b);
         System.out.println(n + " to base " + b + " = " + conv);
      }
   } // end of main
}

// GetNext.java: fetch the next char or int from standard input
//  Uses static methods, THIS IS THE PREFERRED WAY,BECAUSE ONLY
//    ONE INSTANCE OF THESE CLASSES IS NEEDED
import java.io.*;
public class GetNext
{
   // in: reader for reading input data
   private static Reader in = new InputStreamReader(System.in); 

   // ch: holds the next character read
   private static char ch;

   public static char getNextChar() {
      try {
         ch = (char)in.read();
      }
      catch (Exception exception) 
      {
         System.out.println("Error reading character");
         ch = ' ';
      }
      return ch;
   }

   public static int getNextInt() {
      // ...
      // omitted code
   }
}
       
// ConvertBase.java: convert an int n to base b
public class ConvertBase
{
   private static char ch; // char location to hold next

   public static String convertToBase(int n, int b) {
      String s = new String();
      int r;
      while (n != 0) {
         r = n%b;
         ch = (char)(r + '0');
         s = ch + s;
         n = n/b;
      }
      return s;
   }

   // main function to try out Base class
   public static void main (String[] args) {


      int n; // number to convert to base b
      int b; // base for number conversions
      while(true) {
         System.out.print("Number to convert ----->");
         n = GetNext.getNextInt();
         if (n == 0) break;
         System.out.print("Base for conversion --->");
         b = GetNext.getNextInt();
         String conv = new String();
         conv = ConvertBase.convertToBase(n, b);
         System.out.println(n + " to base " + b + " = " + conv);
      }
   } // end of main
}