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ISALPHA(3) FreeBSD Library Functions Manual ISALPHA(3) NAME isalpha - alphabetic character test LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <ctype.h> int isalpha(int c); DESCRIPTION The isalpha() function tests for any character for which isupper(3) or islower(3) is true and for which none of iscntrl(3), isdigit(3), ispunct(3), or isspace(3) is true. In the ``C'' locale, isalpha() returns true only for the characters for which isupper(3) or islower(3) is true. RETURN VALUES The isalpha() function returns zero if the character tests false and returns non-zero if the character tests true. SEE ALSO ctype(3), isalnum(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7) STANDARDS The isalpha() function conforms to ANSI X3.159-1989 ("ANSI C89"). CAVEATS The argument to isalpha() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined. See the CAVEATS section of ctype(3) for more details. FreeBSD 14.1-RELEASE-p8 April 17, 2008 FreeBSD 14.1-RELEASE-p8