Thread: determining environment with C

howdy,

I have to write a little program (for class) which copies files. I set something up using windows.h, pretty simple. However, I'm writing this for use with dos and I want to make sure that dos is available before running the program. This really isn't part of the assignment, but it got me wondering if there is a way (using c) to determine which OS is used.

thanks,
greg

In MS Dev Studio with a WIN32 app I use

GetVersionEx
(used to be GetVersion )

I don't know if this will be available in DOS.

in stdlib.h there is a function called getenv() which
can get some environment variables ...
I suggest to read the man pages of this function.

Otherwise, try the system() function ...