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`strcmp'--character string compare

     #include <string.h>
     int strcmp(const char *A, const char *B);
`strcmp' compares the string at A to the string at B.
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.
`strcmp' is ANSI C.
   `strcmp' requires no supporting OS subroutines.