Can I assume the size of long int is always 4 bytes?

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Is it always true that long int (which as far as I understand is a synonym for long) is 4 bytes?

Can I rely on that? If not, could it be true for a POSIX based OS?

posix linux c types
10 Answers

No, you can't assume that since the size of the “long” data type varies from compiler to compiler.
Check out this article for more details.

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