// usage:  java Intro nums

// introductory program; reads integers from the command line,
// storing them in a linear linked list, maintaining ascending order,
// and then prints out the final list to the screen

// the overall class name must match the file prefix; i.e. the name of
// this file must be Intro.java

import java.io.*;

public class Intro  

{  // standalone Java programs must have a main() function, which is the
   // point where execution begins

   public static void main(String[] Args) {

      // note that locals have no public/private/... prefix; also, we
      // are using the fact that array objects, in this case Args, have  
      // "length" variables built in
      int NumElements = Args.length;

      for (int I = 1; I <= NumElements; I++)  {
         int Num;  
         Num = ConvertArg(Args[I-1]);
         // create a new node
         NumNode NN = new NumNode(Num);
         NN.Insert();
      }

      System.out.println("final sorted list:");
      NumNode.PrintList();
    
   }

   public static int ConvertArg(String Arg)

   {  DataInputStream In = new DataInputStream(System.in);
      InputStreamReader Ins = new InputStreamReader(In);
      BufferedReader Inb = new BufferedReader(Ins);
      while (true)  {
         try  {
            int N = Integer.parseInt(Arg);
            return N;
         }
         catch (NumberFormatException NFE) {
            System.out.println("bad command-line argument--" + NFE);
            System.out.println("enter number again, or type q for quit");
            try  {
               Arg = Inb.readLine();
            }
            catch (IOException IOE) {
               System.out.println("failed to read correction--" + IOE);
               System.exit(1);
            }
            if (Arg.equals("q"))
               System.exit(1);
         }
      }
 
   }

}