You don't need any help with a flowchart. You can do this exercise in your own mind, hence it is possible for you to create a flowchart.
Just detail the steps YOU do when you do this exercise by hand.
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.