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5.23 strcmp—character string compare

Synopsis 

     #include <string.h>
     int strcmp(const char *a, const char *b);

Description
strcmp compares the string at a to the string at b.
Returns
If *a sorts lexicographically after *b, strcmp returns a number greater than zero. If the two strings match, strcmp returns zero. If *a sorts lexicographically before *b, strcmp returns a number less than zero.
Portability
strcmp is ANSI C.

strcmp requires no supporting OS subroutines.