memcmp()

  #include <string.h>
  

  void *memcmp(const void *p,

  

               const void *q,

  

               size_t n);

  

memcmp() compares the first n bytes of the two memory areas pointed to by p and q.

A positive integer, if p is considered greater than q; a negative integer if p is considered smaller than q or zero if the two memory areas are equal.

memchr()

strcmp()

strncmp()