/*	Author:	Marco T. Morazan
	Date:	2/3/2002
	Course:	CSAS 1112
*/

import java.io.*;
import java.util.StringTokenizer;

public class IntListIO
{
	
 /* PRE: infile points to a file that has at least n integers AND
         infile has only one integer per line AND
         n>=0
    POST: return a LinkList containing the first n integers of 
          infile.
 */
 public static LinkList initIntList(BufferedReader infile,
                                    int n) throws IOException
 {LList sublist;
  Integer elem;
  //int k;

  if (n == 0)
   {return(new LinkList());}
  else
   {
    elem = read_int(infile);
    sublist = initIntList(infile, n-1);
    return(new LinkList(elem,sublist));
   }
 }

 /* PRE: outfile points to an output file AND 
         L is a LinkList Integer objects
    POST: The elements of L have been printed in order from
          the first to the last to outfile
 */
 public static void outputIntList(java.io.PrintWriter outfile, 
                                  LList L) throws IOException
 {
  LList lst;
  lst = L;
  while (!(lst.isEmpty()))
  {
   outfile.println(lst.car());
   lst = lst.cdr();
  }
 }

/* PRE: infile points to a file of integers (one per line)
   POST: return an Integer Object with the value of the first
         unread integer in infile.
*/
public static Integer read_int(BufferedReader infile) throws IOException
 {Integer i;
  String s = infile.readLine();
  StringTokenizer st = new StringTokenizer(s);
  i = new Integer(st.nextToken());
  return i;
 }
}