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What does it mean a type 0x00




opened a library for the module on Arduins, there is a type of entry

# define addr_mask 0x1f

It’s 1F I understand some byte in a hexadecimal calculus system, and what is 0x and why is it necessary?

Answer 1, Authority 100%

This is an ordinary integral literal recorded in a sixteenty-old number system. There are other prefixes, in more detail in the corresponding section:
Integral Literal , Character Literal , Floating Literal etc.

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