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+#ifndef hexa_h
+#define hexa_h
+// hexa.h
+// nono - programme du robot 2004. {{{
+//
+// Copyright (C) 2004 Nicolas Schodet
+//
+// Robot APB Team/Efrei 2004.
+// Web: http://assos.efrei.fr/robot/
+// Email: robot AT efrei DOT fr
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+//
+// }}}
+
+/// Converti un caractère hexa (0-9a-f) en chiffre (0-15).
+int hex2digit (char c);
+
+/// Converti un chiffre (0-15) en hexa (0-9a-f).
+char digit2hex (char d);
+
+#endif // hexa_h