// File: TestNumber4.java (Module 8)
//
// Author: Rahul Simha
// Created: October 6, 1998
//
// Formatting with blank-padding.

// File: new_io.java
//
// Screen input/output redefined.
//

import java.text.*;

class EasyFormat {

  // Pad blanks as required (for both int's and double's).
  static String pad_blanks (String s, int target_len, boolean is_int)
  {
    int slen = s.length();

    // No decimal point to worry about with int's.
    if (is_int) {
      if (slen >= target_len) 
	return s;
      // Otherwise we pad from front
      for (int i=1; i <= target_len-slen; i++)
	s = ' ' + s;
      return s;
    }

    // Otherwise check up to decimal point
    int i = s.indexOf ('.');
    if ((i < 0) || (i >= slen)) {
      System.out.println ("ERR: pad_blanks: no decimal point");
      System.exit(1);
    }
    if (i+1 >= target_len) 
      return s;

    // Otherwise, pad with blanks
    for (int j=1; j < =target_len-(i+1); j++)
      s = ' ' + s;
    return s;
  }

  // Format integers.
  public static String format (long i, int width) 
  {
    DecimalFormat df_i = new DecimalFormat ("#");    
    String s_i = df_i.format (i);
    s_i = pad_blanks (s_i, width, true);
    return s_i;
  }

  // Format double's.
  public static String format (double d, int before_dec_pt, 
                                    int after_dec_pt) 
  {
    // Use '#' symbols before decimal point.
    String s = "";
    for (int i=1; i<before_dec_pt; i++)
      s = s + '#';

    // Force a zero for numbers less than 1.0
    s = s + "0.";

    // Include zeroes as specified by width.
    for (int i=1; i<=after_dec_pt; i++)
      s = s + '0';

    DecimalFormat df_d = new DecimalFormat (s);    
    String s_d = df_d.format (d);

    // Pad blanks.
    s_d = pad_blanks (s_d, before_dec_pt, false);
    return s_d;
  }

}


public class TestNumber4 {
  public static void main (String[] argv)
  {
    for (int i=0; i<=1000; i+=200) {
      String s = EasyFormat.format (i, 4);

      int sqr = i * i;

      String sqr_string = EasyFormat.format (sqr, 8);

      double root = Math.sqrt (i);
      String root_string = EasyFormat.format (root, 5, 3);

      System.out.println ("The square of " + s + " is " + sqr_string +
                          " and the square root is " + root_string);
    }
  }
}