increasingDigits

  Write a method called increasingDigits that takes an
   integer n as a parameter and that returns true if the digits of n are
   strictly increasing and that returns false otherwise.  In other words, your
   method should determine if the first digit of the number is strictly less
   than the second digit, and the second digit is strictly less than the third
   digit, and the third digit is strictly less than the fourth digit, and so
   on.  Your method should return true for a one-digit number.

   The table below shows sample calls and the value that should be returned.

        Method                   Value        Method                  Value
         Call                   Returned       Call                  Returned
        ---------------------------------    ---------------------------------
        increasingDigits(0)       true       increasingDigits(8)       true
        increasingDigits(18)      true       increasingDigits(25)      true
        increasingDigits(39)      true       increasingDigits(357)     true
        increasingDigits(1247)    true       increasingDigits(456789)  true
        increasingDigits(42)      false      increasingDigits(33)      false
        increasingDigits(1232)    false      increasingDigits(354)     false
        increasingDigits(543)     false      increasingDigits(37789)   false

   You may not use a String or other object to solve this problem.  You may
   assume that the number passed to your method is not negative, but it might
   be 0.