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diff --git a/kcalc/kcalc_const_button.h b/kcalc/kcalc_const_button.h
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+++ b/kcalc/kcalc_const_button.h
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+/*
+    KCalc, a scientific calculator for the X window system using the
+    Qt widget libraries, available at no cost at http://www.troll.no
+
+    Copyright (C) 1996 Bernd Johannes Wuebben
+                       wuebben@math.cornell.edu
+
+    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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+*/
+
+#ifndef _KCALC_CONST_BUTTON_H
+#define _KCALC_CONST_BUTTON_H
+
+#include <klocale.h>
+#include "kcalc_button.h"
+
+
+class KCalcConstButton : public KCalcButton
+{
+Q_OBJECT
+
+  public:
+
+  KCalcConstButton(QWidget *parent, int but_num, const char * name = 0);
+  
+  KCalcConstButton(const QString &label, QWidget *parent, int but_num, const char * name = 0,
+		   const QString &tooltip = QString());
+
+  QString constant(void) const;
+
+  void setLabelAndTooltip(void);
+
+  private slots:
+  void slotConfigureButton(int option);
+  void slotChooseScientificConst(int option);
+
+  private:
+  void initPopupMenu(void);
+  
+  KPopupMenu* _popup;
+  int _button_num;
+};
+
+
+#endif  // _KCALC_CONST_BUTTON_H