memcpy

memcmp

#include <string.h>int memcmp(const void *buf1, const void *buf2,  size_t count);

The memcmp( ) function compares the first count characters of the arrays pointed to by buf1 and buf2.

The memcmp( ) function returns an integer that is interpreted as indicated here:

Value	Meaning
Less than zero	buf1 is less than buf2
Zero	buf1 is equal to buf2
Greater than zero	buf1 is greater than buf2

Related functions are memchr( ), memcpy( ), and strcmp( ).