You probably missed the part where Perspective says "we're talking about editors that place x number of spaces in the file when you push the tab key" and where twomers adds "How do you delete the spaces? ctrl + backspace!!".
Ctrl + backspace deletes all the spaces, so it's kind of useless for that.
Btw, still reading the thread.
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.