MirOS Manual: isalpha(3)

ISALPHA(3)                 BSD Programmer's Manual                  ISALPHA(3)


     isalpha - alphabetic character test


     #include <ctype.h>

     isalpha(int c);


     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.


     The isalpha() macro returns zero if the character tests false or non-zero
     if the character tests true.


     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)


     The isalpha() function conforms to ANSI X3.159-1989 ("ANSI C").


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

MirOS BSD #10-current           June 29, 1991                                1

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