Can I use everything in this C library for aduino uno R3?

Using Arduino Programming Questions
#1

http://www.cplusplus.com/reference/cstring/memcmp/

Hi everyone

I am trying to learn more about C programming.

I came across this website. I was wondering if this C library could be used in the arduino IDE

without including the h files.

I have only tried the memcmp example without including anything.

Thanks a lot.

#2

The Arduino environment supports the vast majority of C++ and hence C. Which particular library did you have in mind.

#3

The Arduino environment supports the vast majority of C++ and hence C.

Thanks for that. I am still scratching the surface.

You have given me a good answer.

Have a nice day!

#4