Man Page isdigit.3

                       Standard C++ Library
             Copyright 1998, Rogue Wave Software, Inc.

NAME

     isdigit

      - Determines if a character is a decimal digit.

SYNOPSIS

     #include <locale>

     template <class charT>
     bool isdigit (charT c, const locale& loc) const;

DESCRIPTION

     The isdigit_function returns true if the character passed as
     a  parameter  is  a  decimal  digit.  Otherwise the function
     returns false.   The check is made  using  the  ctype  facet
     from the locale parameter.

SEE ALSO

     Other 'is' functions, locale, ctype