Is there a way to check what funcions a library in c++ has while

Look inside the header file for that library.

>>60307471
Get a book like The C++ Standard Library: A Tutorial and Reference by Josuttis

>>60307545
I will be having exam today and Im afraid that I'll forget functions, so if that happens I will have a way to save myself

>>60307487
How do I do that?

>>60307587
Find the header files for your compiler or that library, they can be in various places depending on what library it is, what compiler you use, what OS you have etc. They should end in .h or .hpp extensions.

>>60307471
devdocs.io but if you're looking for win32 documentation, have fun with that