The C standard library
The C standard library offers quite a bit of functionality. The first thing to be aware of when using any part of this library is what’s in it. The following tables provide the header filenames and descriptions of the functions prototyped in each header file.
The following table shows the library files before C99:
The following table shows which files have been added to C99:
If you have been compiling programs throughout this book, these files will already exist on your system. You need to find out where they are so that you can open them with an editor and examine exactly what is in them.