If I want to copyright my own final source code - do I have to contact the GPL? (General Public License) and pay a fee?
GPL is free for anyone to use. It's not the only license available either. Pick the one that suits your team best.
Originally Posted by Adak
io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
Originally Posted by Salem
You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.
Outside of your DOS world, your header file is meaningless.