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CTYPE(3)                 BSD Library Functions Manual                 CTYPE(3)

NAME
     isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct,
     isprint, isgraph, iscntrl, isblank, isascii, toupper, tolower, toascii --
     character classification macros

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <&lt;ctype.h>&gt;
     int c

     isalpha(c);

     isupper(c);

     islower(c);

     isdigit(c);

     isxdigit(c);

     isalnum(c);

     isspace(c);

     ispunct(c);

     isprint(c);

     isgraph(c);

     iscntrl(c);

     isblank(c);

     isascii(c);

     toupper(c);

     tolower(c);

     toascii(c);

DESCRIPTION
     The above macros perform character tests and conversions on the integer
     c.

     See the specific manual pages for more information.

SEE ALSO
     isalnum(3), isalpha(3), isascii(3), isblank(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), ascii(7)

STANDARDS
     These functions, with the exception of isblank() and toascii(), conform
     to ANSI X3.159-1989 (``ANSI C89'').

BSD                             April 19, 1991                             BSD