How work with file <stdlib.h>?

Answer 1

Thank you

Answer 2

In C you get access to these libraries:

https://en.cppreference.com/w/c/memory
https://en.cppreference.com/w/c/program
https://en.cppreference.com/w/c/string
https://en.cppreference.com/w/c/numeric/random

In C++, the recomanded file is <cstdlib> because it imports everything into the std namespace, where as <stdlib.h> (which you can still use), imports everything into the global namespace. In any case here is the C++ documentation. The library is similar to C's, but not identical:

https://en.cppreference.com/w/cpp/header/cstdlib

I hope this is what you're looking for.