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memcmp
======
Syntax
------
#include <string.h>
int memcmp(const void *s1, const void *s2, size_t num);
Description
-----------
This function compares two regions of memory, at S1 and S2, for NUM
bytes.
Return Value
------------
zero
s1 == s2
positive
s1 > s2
negative
s1 < s2