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diff --git a/kbruch/src/exerciseconvert.h b/kbruch/src/exerciseconvert.h
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+/***************************************************************************
+                              exerciseconvert.h
+                             -------------------
+    begin                : 2004/06/04
+    copyright            : (C) 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 EXERCISECONVERT_H
+#define EXERCISECONVERT_H
+
+#ifdef DEBUG
+#include <kdebug.h>
+#endif
+
+#include "exercisebase.h"
+#include "ratio.h"
+
+class RationalWidget;
+class ResultWidget;
+
+class QFrame;
+class QGridLayout;
+class QLabel;
+class QLineEdit;
+class QPushButton;
+class QString;
+class QVBoxLayout;
+
+/*! Construct the exercise widget to convert rational numbers into fractions
+ *
+ *  \author Sebastian Stein
+ * */
+class ExerciseConvert : public ExerciseBase
+{
+	Q_OBJECT
+
+public:
+	/** constructor */
+	ExerciseConvert(QWidget * parent = 0, const char * name = 0);
+
+	/** destructor */
+	~ExerciseConvert();
+
+	/** force the creation of a new task */
+	void forceNewTask();
+
+public slots:
+	void update();
+
+signals:
+	/** class emits this signal, if the task was solved correctly by the user */
+	void signalExerciseSolvedCorrect();
+
+	/** class emits this signal, if the task was solved not correctly by the user
+	 * */
+	void signalExerciseSolvedWrong();
+
+private:
+	short m_currentState;
+
+	QString m_number;
+	uint m_periodStart;
+	uint m_periodLength;
+	ratio m_result;
+
+	RationalWidget* m_rationalWidget;
+	ResultWidget* m_resultWidget;
+	QLineEdit* numer_edit;
+	QFrame* edit_line;
+	QLineEdit* deno_edit;
+
+	QPushButton* m_checkButton;
+	QLabel* result_label;
+
+	QGridLayout* baseGrid;
+	QWidget* baseWidget;
+	QVBoxLayout* realLayout;
+
+	void createTask();
+	void showResult();
+	void nextTask();
+
+private slots:
+	void slotCheckButtonClicked();
+};
+
+#endif