This documentation is copyright © 1998-2001 Sandro Sigala <sandro@sigala.it>. All rights reserved. Released under the GNU General Public License.
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#include <wctype.h> int iswalpha(int c);
isupper
or islower
is true. In other implementation-defined set
of characters returns true for the characters for which none of
iscntrl
, isdigit
, ispunct
, or isspace
is true.