Hexadecimal

 You can use this type of constant wherever numeric constants are
 allowed; it assumes a numeric data type according to its context.

 A hexadecimal constant has one of these forms:

   Z'd[d...]'
   Z"d[d...]"

   d   Is a hexadecimal (base 16) digit in the range 0 - 9, 
       or a letter in the range A - F, or a - f

 You can specify up to 128 bits in hexadecimal (32 hexadecimal
 digits) constants.  Leading zeros are ignored.