No, don't take it as an order. Just take into consideration.
Easy solutions can easily break when things scale up in complexity.
It's a suggestion, and an advice, and a question to see if you are aware of the consequences.
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.