// File: screen_io3.java
//
// Author; Rahul Simha
// Created: Aug 17, 1998
//
// Another example in screen I/O

import java.io.*;

public class screen_io3 {

  // Read in a string after putting out a prompt.

  public static String read_string (String prompt)
  {
    OutputStreamWriter osw = new OutputStreamWriter (System.out);
    BufferedWriter bw = new BufferedWriter (osw);
    try {
      bw.write (prompt);
      bw.flush ();        // Need to flush buffer to ensure output
    }
    catch (IOException e) {
      System.out.println ("new_io::read_string_prompt1: cannot write\n");
      System.exit (1);
      return "";
    }
    InputStreamReader isr = new InputStreamReader (System.in);
    LineNumberReader lr = new LineNumberReader (isr);
    try {
      String s = lr.readLine ();
      return s;
    }
    catch (IOException e) {
      System.out.println ("new_io::read_string_prompt1: cannot read\n");
      System.exit (1);
      return "";
    }
  }


  // Read in an int.

  public static int read_int (String prompt)
  {
    String s = read_string (prompt);
    while (true) {
      try {
        int i = Integer.parseInt (s);
        return i;
      }
      catch (NumberFormatException e) {
        s = read_string (prompt);
      }
    }
  }

  public static void main (String[] argv)
  {
    // Example:
    int i = read_int ("Enter an int: ");
    System.out.println ("What you entered: " + i);
  }
}