--- /dev/null	
+++ scsolver/source/numeric/exception.cxx	
@@ -0,0 +1,58 @@
+/*************************************************************************
+ *
+ *  The Contents of this file are made available subject to
+ *  the terms of GNU Lesser General Public License Version 2.1.
+ *
+ *
+ *    GNU Lesser General Public License Version 2.1
+ *    =============================================
+ *    Copyright 2005 by Kohei Yoshida.
+ *    1039 Kingsway Dr., Apex, NC 27502, USA
+ *
+ *    This library is free software; you can redistribute it and/or
+ *    modify it under the terms of the GNU Lesser General Public
+ *    License version 2.1, as published by the Free Software Foundation.
+ *
+ *    This library 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
+ *    Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with this library; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *    MA  02111-1307  USA
+ *
+ ************************************************************************/
+
+#include "numeric/exception.hxx"
+
+namespace scsolver { namespace numeric { namespace opres {
+
+
+const char* ConstraintError::what() const throw()
+{
+	return "Constraint error";
+}
+
+const char* AssertionWrong::what() const throw()
+{
+	return "Wrong assertion! (tell Kohei immediately)";
+}
+
+const char* ModelInfeasible::what() const throw()
+{
+	return "Model infeasible";
+}
+
+const char* MaxIterationReached::what() const throw()
+{
+	return "Maximum iteration reached";
+}
+
+const char* IterationTimedOut::what() const throw()
+{
+	return "Iteration timed out";
+}
+
+}}}
