Hexadecimal integer literals

A hexadecimal integer literal begins with the 0 digit followed by either an x or X, followed by any combination of the digits 0 through 9 and the letters a through f or A through F. The letters A (or a) through F (or f) represent the values 10 through 15, respectively.

Hexadecimal integer literal syntax
 
           .------------------.
           V                  |
>>-+-0x-+----+-digit_0_to_f-+-+--------------------------------><
   '-0X-'    '-digit_0_to_F-'
 

The following are examples of hexadecimal integer literals:

0x3b24 
0XF96 
0x21 
0x3AA 
0X29b 
0X4bD