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islower(3)

NAME

     islower -- lower-case character test

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <ctype.h>

     int
     islower(int c);

DESCRIPTION

     The islower() function tests for any lower-case letters.  For single C
     chars locales (see multibyte(3)) the value of the argument is repre-
     sentable as an unsigned char or the value of EOF.	In the ASCII character
     set, this includes the following characters (with their numeric values
     shown in octal):

     141 ``a''	   142 ``b''	 143 ``c''     144 ``d''     145 ``e''
     146 ``f''	   147 ``g''	 150 ``h''     151 ``i''     152 ``j''
     153 ``k''	   154 ``l''	 155 ``m''     156 ``n''     157 ``o''
     160 ``p''	   161 ``q''	 162 ``r''     163 ``s''     164 ``t''
     165 ``u''	   166 ``v''	 167 ``w''     170 ``x''     171 ``y''
     172 ``z''

RETURN VALUES

     The islower() function returns zero if the character tests false and
     returns non-zero if the character tests true.

COMPATIBILITY

     The 4.4BSD extension of accepting arguments outside of the range of the
     unsigned char type in locales with large character sets is deprecated.
     The iswlower() function should be used instead for maximum portability.

SEE ALSO

     ctype(3), iswlower(3), multibyte(3), tolower(3), ascii(7)

STANDARDS

     The islower() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

FreeBSD 5.4			 July 30, 2004			   FreeBSD 5.4

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