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/*
KCalc, a scientific calculator for the X window system using the
Qt widget libraries, available at no cost at http://www.troll.no
Copyright (C) 1996 Bernd Johannes Wuebben
wuebben@math.cornell.edu
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef _KCALC_CORE_H
#define _KCALC_CORE_H
#include "stats.h"
#include <qvaluestack.h>
#include "knumber.h"
#define POS_ZERO 1e-19L /* What we consider zero is */
#define NEG_ZERO -1e-19L /* anything between these two */
typedef KNumber (*Arith)(const KNumber &, const KNumber &);
typedef KNumber (*Prcnt)(const KNumber &, const KNumber &);
#define UNUSED(x) ((void)(x))
struct operator_data {
int precedence; // priority of operators in " enum Operation"
Arith arith_ptr;
Prcnt prcnt_ptr;
};
class CalcEngine
{
public:
// operations that can be stored in calculation stack
enum Operation {
FUNC_EQUAL,
FUNC_PERCENT,
FUNC_BRACKET,
FUNC_OR,
FUNC_XOR,
FUNC_AND,
FUNC_LSH,
FUNC_RSH,
FUNC_ADD,
FUNC_SUBTRACT,
FUNC_MULTIPLY,
FUNC_DIVIDE,
FUNC_MOD,
FUNC_INTDIV,
FUNC_POWER,
FUNC_PWR_ROOT
};
CalcEngine();
KNumber lastOutput(bool &error) const;
void enterOperation(KNumber num, Operation func);
void ArcCosDeg(KNumber input);
void ArcCosRad(KNumber input);
void ArcCosGrad(KNumber input);
void ArcSinDeg(KNumber input);
void ArcSinRad(KNumber input);
void ArcSinGrad(KNumber input);
void ArcTangensDeg(KNumber input);
void ArcTangensRad(KNumber input);
void ArcTangensGrad(KNumber input);
void AreaCosHyp(KNumber input);
void AreaSinHyp(KNumber input);
void AreaTangensHyp(KNumber input);
void Complement(KNumber input);
void CosDeg(KNumber input);
void CosRad(KNumber input);
void CosGrad(KNumber input);
void CosHyp(KNumber input);
void Cube(KNumber input);
void CubeRoot(KNumber input);
void Exp(KNumber input);
void Exp10(KNumber input);
void Factorial(KNumber input);
void InvertSign(KNumber input);
void Ln(KNumber input);
void Log10(KNumber input);
void ParenClose(KNumber input);
void ParenOpen(KNumber input);
void Reciprocal(KNumber input);
void SinDeg(KNumber input);
void SinGrad(KNumber input);
void SinRad(KNumber input);
void SinHyp(KNumber input);
void Square(KNumber input);
void SquareRoot(KNumber input);
void StatClearAll(KNumber input);
void StatCount(KNumber input);
void StatDataNew(KNumber input);
void StatDataDel(KNumber input);
void StatMean(KNumber input);
void StatMedian(KNumber input);
void StatStdDeviation(KNumber input);
void StatStdSample(KNumber input);
void StatSum(KNumber input);
void StatSumSquares(KNumber input);
void TangensDeg(KNumber input);
void TangensRad(KNumber input);
void TangensGrad(KNumber input);
void TangensHyp(KNumber input);
void Reset();
private:
KStats stats;
typedef struct {
KNumber number;
Operation operation;
} _node;
// Stack holds all operations and numbers that have not yet been
// processed, e.g. user types "2+3*", the calculation can not be
// executed, because "*" has a higher precedence than "+", so we
// need to wait for the next number.
//
// In the stack this would be stored as ((2,+),(3,*),...)
//
// "enterOperation": If the introduced Operation has lower priority
// than the preceding operations in the stack, then we can start to
// evaluate the stack (with "evalStack"). Otherwise we append the new
// Operation and number to the stack.
//
// E.g. "2*3+" evaluates to "6+", but "2+3*" can not be evaluated
// yet.
//
// We also take care of brackets, by writing a marker "FUNC_BRACKET"
// into the stack, each time the user opens one. When a bracket is
// closed, everything in the stack is evaluated until the first
// marker "FUNC_BRACKET" found.
QValueStack<_node> _stack;
KNumber _last_number;
bool _percent_mode;
static const struct operator_data Operator[];
bool evalStack(void);
KNumber evalOperation(KNumber arg1, Operation operation, KNumber arg2);
const KNumber Deg2Rad(const KNumber &x) const
{ return KNumber(2) * KNumber::Pi / KNumber(360) * x; }
const KNumber Gra2Rad(const KNumber &x) const
{ return KNumber(2)*KNumber::Pi / KNumber(400) * x; }
const KNumber Rad2Deg(const KNumber &x) const
{ return KNumber(360) / (KNumber(2) * KNumber::Pi) * x; }
const KNumber Rad2Gra(const KNumber &x) const
{ return KNumber(400) / (KNumber(2)*KNumber::Pi) * x; }
};
#endif //_KCALC_CORE_H
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