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// SPDX-FileCopyrightText: 2005 Pino Toscano <toscano.pino@tiscali.it>
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <QString>
/**
* Simple class that represents an equation.
*
* It does not do any calculation, it serves only as a helper to write
* equations like \f$ 7 xy + 3 y^2 - 5 x - 2 y + 8 = 0 \f$ in a pretty form.
* It can handle equations of max two variables (named \em x and \em y ) with
* no limits on the grade of the terms. (well, the limit is 15, but I doubt
* anyone will ever use such a factor for a power...)
*/
// * Use the addTerm() method to add a term to the equation, and removeTerm() to
// * remove one. After that, use prettyString() to get the equation written in a
// * nice form.
// *
// * \note
// * If you want to use only the \em x variable, you can unspecify the last
// * parameters in the term manipulation methods, like addTerm(), term() and
// * removeTerm().
// *
// * @author Pino Toscano
// */
/*
* What follows is based on code by Maurizio Paolini
*/
class EquationString : public QString
{
public:
EquationString(const QString &string);
double trunc(double);
void prettify(void);
void addTerm(double coeff, const QString &unknowns, bool &needsign);
const QString x3() const;
const QString y3() const;
const QString x2y() const;
const QString xy2() const;
const QString x2() const;
const QString y2() const;
const QString xy() const;
const QString x() const;
const QString y() const;
const QString xnym(int n, int m) const;
};
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