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CTYPE(3)		     Library Functions Manual			CTYPE(3)

NAME
     digittoint,  isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph,
     ishexnumber, isideogram, islower, isnumber, isphonogram, isprint,	ispunct,
     isrune, isspace, isspecial, isupper, isxdigit, toascii, tolower, toupper --
     character classification functions

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <ctype.h>

     int
     digittoint(int c);

     int
     isalnum(int c);

     int
     isalpha(int c);

     int
     isascii(int c);

     int
     iscntrl(int c);

     int
     isdigit(int c);

     int
     isgraph(int c);

     int
     ishexnumber(int c);

     int
     isideogram(int c);

     int
     islower(int c);

     int
     isnumber(int c);

     int
     isphonogram(int c);

     int
     isspecial(int c);

     int
     isprint(int c);

     int
     ispunct(int c);

     int
     isrune(int c);

     int
     isspace(int c);

     int
     isupper(int c);

     int
     isxdigit(int c);

     int
     toascii(int c);

     int
     tolower(int c);

     int
     toupper(int c);

DESCRIPTION
     The  above functions perform character tests and conversions on the integer
     c.  They are available as macros, defined in the include file <ctype.h>, or
     as true functions in the C library.  See the specific manual pages for more
     information.

SEE ALSO
     digittoint(3), isalnum(3), isalpha(3), isascii(3), isblank(3),  iscntrl(3),
     isdigit(3),  isgraph(3),  isideogram(3),  islower(3),  isphonogram(3),  is-
     print(3),	ispunct(3),  isrune(3),  isspace(3),  isspecial(3),  isupper(3),
     isxdigit(3), toascii(3), tolower(3), toupper(3), wctype(3), ascii(7)

STANDARDS
     These   functions,   except  for  digittoint(),  isascii(),  ishexnumber(),
     isideogram(),  isnumber(),   isphonogram(),   isrune(),   isspecial()   and
     toascii(), conform to ISO/IEC 9899:1990 ("ISO C90").

HISTORY
     The  functions  isalpha(),  isupper(), islower(), isdigit(), isalnum(), is-
     space(), ispunct(), isprint(), iscntrl(), and isascii() first  appeared  in
     Version 7 AT&T UNIX.

FreeBSD 15.1			  April 3, 2022 			CTYPE(3)
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