isalpha man page on BSDi
[printable version]
ISALPHA(3) BSD Programmer's Manual ISALPHA(3)
NAME
isalpha - alphabetic character test
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() re-
turns true only for the characters for which isupper(3) or islower(3) is
true.
RETURN VALUES
The isalpha() macro returns zero if the character tests false and returns
non-zero if the character tests true.
SEE ALSO
isascii(3), isalnum(3), iscntrl(3), isdigit(3), isgraph(3),
islower(3), isprint(3), ispunct(3), isspace(3), isupper(3),
isxdigit(3), toascii(3), tolower(3), toupper(3), stdio(3) ascii(7)
STANDARDS
The isalpha() function conforms to ANSI C X3.159-1989 (``ANSI C '').
BSDI BSD/OS June 29, 1991 1
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