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diff --git a/kbruch/src/ratio.h b/kbruch/src/ratio.h
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+/***************************************************************************
+                          ratio.h  -  class ratio
+                             -------------------
+    begin                : Tue Nov 27 16:40:42 CET 2001
+    copyright            : (C) 2001-2004 by Sebastian Stein
+    email                : seb.kde@hpfsc.de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   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.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef RATIO_H
+#define RATIO_H
+
+#include <qtextstream.h>
+
+/** Represents a ratio
+ *  This class represents 1 ratio. There are several functions provided to
+ *  modify the numerator and denominator. It is also possible to calculate with
+ *  objects of the class ratio. Overloaded operation functions are provided for
+ *  this task.
+ *  \author Sebastian Stein */
+class ratio
+{
+public:
+	/** constructor */
+	ratio(int pnumerator = 0, int pdenominator = 1);
+
+	/** copy constructor */
+	ratio(const ratio & copy_ratio);
+
+	/** destructor */
+	~ratio();
+
+	/** returns the ratio as QTextStream object */
+	QTextStream & display(QTextStream & str) const;
+
+	/** returns the numerator */
+	int numerator() const;
+
+	/** returns the denominator */
+	int denominator() const;
+
+	/** set numerator and reduce the ratio */
+	void setNumerator(int pnumerator = 0, bool reduce = true);
+
+	/** set denominator and reduce the ratio */
+	void setDenominator(int pdenominator = 1, bool reduce = true);
+
+	/** operator overloading for: c = object + summand */
+	ratio operator+(ratio addend);
+
+	/** operator overloading for: c = object - subtrahend */
+	ratio operator-(ratio subtrahend);
+
+	/** operator overloading for: c = object * factor */
+	ratio operator*(ratio factor);
+
+	/** operator overloading for: c = object / divisor */
+	ratio operator/(ratio divisor);
+
+	/** set numerator with dummy and denominator = 1 */
+	ratio operator=(int dummy);
+
+	/** compares the current ratio with a given one */
+	bool operator==(ratio right);
+
+	/** compares the current ratio with a given one */
+	bool operator<(ratio right);
+
+	/** compares the current ratio with a given one */
+	bool operator>(ratio right);
+
+	/** exchange numerator and denominator */
+	void reziproc();
+
+	/** reduce the ratio */
+	void reduce();
+private:
+	/** numerator */
+	int m_numerator;
+
+	/** denominator */
+	int m_denominator;
+
+	/** change sign of the ratio */
+	void change_sign();
+}
+;
+
+/* ------ some prototyps of non class functions ------ */
+
+/** it is possible to code: cout << ratio_object << endl; */
+QTextStream & operator<<(QTextStream & str, const ratio & pratio);
+
+#endif