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103 lines
3.1 KiB
103 lines
3.1 KiB
15 years ago
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/***************************************************************************
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ratio.h - class ratio
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-------------------
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begin : Tue Nov 27 16:40:42 CET 2001
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copyright : (C) 2001-2004 by Sebastian Stein
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email : seb.kde@hpfsc.de
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef RATIO_H
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#define RATIO_H
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#include <qtextstream.h>
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/** Represents a ratio
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* This class represents 1 ratio. There are several functions provided to
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* modify the numerator and denominator. It is also possible to calculate with
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* objects of the class ratio. Overloaded operation functions are provided for
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* this task.
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* \author Sebastian Stein */
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class ratio
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{
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public:
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/** constructor */
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ratio(int pnumerator = 0, int pdenominator = 1);
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/** copy constructor */
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ratio(const ratio & copy_ratio);
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/** destructor */
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~ratio();
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/** returns the ratio as QTextStream object */
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QTextStream & display(QTextStream & str) const;
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/** returns the numerator */
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int numerator() const;
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/** returns the denominator */
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int denominator() const;
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/** set numerator and reduce the ratio */
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void setNumerator(int pnumerator = 0, bool reduce = true);
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/** set denominator and reduce the ratio */
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void setDenominator(int pdenominator = 1, bool reduce = true);
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/** operator overloading for: c = object + summand */
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ratio operator+(ratio addend);
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/** operator overloading for: c = object - subtrahend */
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ratio operator-(ratio subtrahend);
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/** operator overloading for: c = object * factor */
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ratio operator*(ratio factor);
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/** operator overloading for: c = object / divisor */
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ratio operator/(ratio divisor);
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/** set numerator with dummy and denominator = 1 */
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ratio operator=(int dummy);
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/** compares the current ratio with a given one */
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bool operator==(ratio right);
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/** compares the current ratio with a given one */
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bool operator<(ratio right);
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/** compares the current ratio with a given one */
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bool operator>(ratio right);
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/** exchange numerator and denominator */
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void reziproc();
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/** reduce the ratio */
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void reduce();
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private:
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/** numerator */
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int m_numerator;
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/** denominator */
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int m_denominator;
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/** change sign of the ratio */
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void change_sign();
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}
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;
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/* ------ some prototyps of non class functions ------ */
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/** it is possible to code: cout << ratio_object << endl; */
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QTextStream & operator<<(QTextStream & str, const ratio & pratio);
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#endif
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