can this cause issues?

[Red Squirrel]

one of my program deals with a lot of "long unsigned ints" which can make a function very long and hard to follow.

I put this at the start of my program:

#define uint long unsigned int

So I can use uint to declare one. It works, but could this cause a problem down the line? I can't see how, but thought I'd check so I don't run into any surprises later. i want to start using uint throughout my whole program.

[Plasmator]

It works, but could this cause a problem down the line?

Yes. The pre-processor doesn't care about language rules. Things like scope obedience are non-existent, for example.

As a general rule of thumb, avoid using the pre-processor when a language feature (a typedef, in this case) can do the job.

[Red Squirrel]

Oh right I forgot bout typedefs, I used that instead. Thanks.