Implicit conversions. They are so evil that they're nearly useless when you want to overload operators such as operator T or operator bool.
The fact that you can't make them explicit annoys me.
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.