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Message: [QUOTE="J. J. Farrell, post: 1698403"] I don't believe it does. It allows pointers to be converted to integers in implementation-defined ways. It's not clear to me that it requires that a big enough integer exists (in C89 at least) and I'd welcome chapter and verse if it does. K&R2's Reference Manual says that converting a pointer to a 'big enough' integer and back again will give a pointer that points to the original object. I can't see how to derive this from the Standard, so chapter and verse would be welcome again if it's there. The Standard does imply that this is the preferred implementation. [/QUOTE]