If you are writing normal code then yes. But there are always exceptions. One is trying to learn how your current target architecture actually works. This is

If you are writing normal code then yes. But there are always exceptions. One is trying to learn how your current target architecture actually works. This is not production code. It's a "where in memory did the compiler decide to put that" question. You may get the results you expect or you may get someting totally bizzare. But since the purpose is discovering how the compiler works there is no wrong result. Another is if you are writing your own memory manager. Here there are a lot of pointer comparisons to not the same allocated objects. But a memory manager is very OS and architecture specific so you will probably have to rewrite it when porting the code. Having said all that, I wouldn't subtract the two void pointers like the example did. I would have converted them both to integers first and then subtract. Again, since this is for debugging and/or learning purposes then it's OK to bend the language rules a bit.