library

[MattC98]

I have a class which uses "fopen" , "fread" and isdigit.
But I dont include cstdio or cctype , I use Windows , and im not sure if it runs because im windows or if it work without thos elibraries on linux as well, i participate in algorithmic contests and I want to know if i should include cstdio and cctype

[jonnin]

This generally happens due to header chaining. Something of yours includes something that includes something that includes something.... that includes these headers.

If you use it in a file, include it. Then it will work if you use it in another program. It won't hurt anything to re-include it.