ISALPHA(3) AerieBSD 1.0 Refernce 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(); returns 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 or non-zero if the character tests true.

SEE ALSO

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

CAVEATS

The argument to isalpha(); must be EOF or representable as an unsigned char; otherwise, the result is undefined.

AerieBSD 1.0 Reference Manual August 26 2008 ISALPHA(3)