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I understand now. Gcc's default mode is "gnu89" which supports C99 features. In c89 mode:

Thanks for all the answers to my original question as well.

Do you mean that isn't possible in C? Gcc compiles it without any problems.

Why not const variables? In discussions about it, I see nearly everyone saying it's better to use const, yet C programmers seem to use #define all the time for simple constant integers.
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