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diff --git a/noncore/tools/calc2/instruction.h b/noncore/tools/calc2/instruction.h
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+/**********************************************************************
+** Copyright (C) 2000 Trolltech AS.  All rights reserved.
+**
+** This file is part of Qtopia Environment.
+**
+** This file may be distributed and/or modified under the terms of the
+** GNU General Public License version 2 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+** See http://www.trolltech.com/gpl/ for GPL licensing information.
+**
+** Contact info@trolltech.com if any conditions of this licensing are
+** not clear to you.
+**
+**********************************************************************/
+#ifndef INSTRUCTION_H
+#define INSTRUCTION_H
+
+/* Internal representation of data
+The first four types indicate an int,
+that is, Data.i, and are incompatible
+with the other two types.
+
+- Plugin is responsible for telling engine
+which Rep to use at any given time
+- Instructions from that plugin only
+have to handle that representation
+- Engine is responsible for error-checking
+according to its current rep and display */
+enum Representation {
+    rBin,
+    rOct,
+    rDec,
+    rHex,
+    rDouble,
+    rFraction
+};
+
+// An atom of data
+union Data {
+    int i;
+    double dbl;
+    struct Fraction {
+        int numerator, denominator;
+    } fraction;
+};
+
+// Instruction base class
+class Instruction {
+public:
+  Instruction (int p = 0) {
+    precedence = p;
+  };
+
+  virtual ~ Instruction () {};
+
+  virtual Data eval(Data) = 0;
+    void setRep(Representation r) { rep = r; };
+
+  Representation rep;
+  Data acc;
+  int precedence;
+};
+
+#endif