Programming help

Using Arduino Programming Questions
#1

In trying to understand a program that using sprintf and contains *%04X\n I just don't know what the X is for?

Is it like a type... f for float etc?

Thanks for any help!

#2

Docs say:

Unsigned hexadecimal integer (uppercase)

#3

https://en.cppreference.com/w/cpp/io/c/fprintf#Parameters

#4

Thank you all so much!!!

#5

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