example_session.txt

23456431
zeekoomes
213412345
pyhooduku
234234
rykeew
123123
hydom
11223344
bifaveek
494746215
mujyjysud
657234865
dimifipif

Memorator.java

package ca.fuerth.misc;

import static java.lang.Long.*;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Memorator {

  public static void main(String[] args) throws IOException {
    for (String arg : args) {
      System.out.println(arg + ": " + toMemorableString(parseLong(arg)));
    }
    if (args.length == 0) {
      System.err.println("Reading stdin. Use blank line to abort.");
      BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
      for (;;) {
        String s = in.readLine();
        if (s.equals("")) {
          break;
        }
        System.out.println(toMemorableString(parseLong(s)));
      }
    }
  }

  /** The code requires this list to have 16 entries */
  private static final String[] CONSONANTS = {
    "b", "d", "f", "h",
    "j", "k", "l", "m",
    "n", "p", "r", "s",
    "t", "v", "w", "z" };

  /** The code requires this list to have 8 entries */
  private static final String[] VOWELS = {
    "a", "e", "ee", "i",
    "o", "oo", "u", "y" };

  /**
   * Makes a reasonably easy-to-pronounce gibberish word from the given number. On average, the word will have about as
   * many characters as the number would have when printed as a decimal, but (especially for large numbers) it will be
   * easier to remember as a single word.
   *
   * @param num The number to convert.
   * @return The memorable string, unique to the given number. Never null.
   */
  public static String toMemorableString(long num) {
    StringBuilder memorable = new StringBuilder();
    for (;;) {
      memorable.append(CONSONANTS[(int) (num & 0xf)]);
      num >>= 4;
      if (num == 0) break;

      memorable.append(VOWELS[(int) (num & 7)]);
      num >>= 3;
      if (num == 0) break;
    }
    return memorable.toString();
  }

}