What 0x means?
0X or 0-X (zero X) may refer to: 0x, a prefix for hexadecimal numeric constants in computing.
What is 0x03?
Break down the parts. Yes, 0x03 is in hexadecimal (and is equivalent to 3, but often times using hex makes it more clear to see the special bit patterns). – user166390. Jul 12 ’12 at 0:57.