// $Id: calc.cpp,v 1.26 2001/09/27 08:24:57 wyy Exp $
//
// William Emmanuel S. YU <william.s.yu@ieee.org>
// Ateneo de Manila University, Philippines
//
// QT C++ Calculator
// Copyright (C) 2002  William Emmanuel S. Yu
//
// 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
// 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
#include "calc.h"
#include <math.h>

#ifdef DEBUG
#include <iostream.h>
#endif

FCalcMethod::FCalcMethod( QWidget* parent,  const char* name, bool modal, WFlags fl )
    : FCalc( parent, name, modal, fl )
{
    if ( !name )
	setName( "FCalcMethod" );
	
	myString = new QString();
	myMonitor = 1;
	operand1 = 0;
	operand2 = 0;
	myOperator = 0;
}

FCalcMethod::~FCalcMethod()
{
}

// perform square root
void FCalcMethod::psqrt()
{
#ifdef DEBUG
	cout << "Data:" << operand1 << " " << operand2 << " " << myOperator << endl;
#endif
	
	QString s2;
	s2 = Display->text();
	bool ok;
	operand2 = s2.toDouble ( &ok );
	result = sqrt(operand2);
	
	Display->clear();
	myString->setNum ( result, 'g', 6 );
	Display->insert ( *myString );
	myMonitor = 1;
	operand1 = result;
	operand2 = 0;
}


void FCalcMethod::allClear()
{
    	Display->clear();

} /* allClear */

void FCalcMethod::add()
{
#ifdef DEBUG
	cout << "Data:" << operand1 << " " << operand2 << " " << myOperator << endl;
#endif
	
	QString s;
	s = Display->text();
	Display->clear();
	bool ok;
	operand1 = s.toDouble ( &ok );
	myOperator = 1;
    	
} /* add() */


void FCalcMethod::subtract()
{
#ifdef DEBUG
	cout << "Data:" << operand1 << " " << operand2 << " " << myOperator << endl;
#endif
	
 	QString s;
	s = Display->text();
	Display->clear();
	bool ok;
	operand1 = s.toDouble ( &ok );
	myOperator = 2;	

} /* subtract() */


void FCalcMethod::divide()
{
#ifdef DEBUG
	cout << "Data:" << operand1 << " " << operand2 << " " << myOperator << endl;
#endif
	
	QString s;
	s = Display->text();
	Display->clear();
	bool ok;
	operand1 = s.toDouble ( &ok );
	myOperator = 4;

} /* divide() */


void FCalcMethod::modulo()
{
#ifdef DEBUG
	cout << "Data:" << operand1 << " " << operand2 << " " << myOperator << endl;
#endif
	
	QString s;
	s = Display->text();
	Display->clear();
	bool ok;
	operand1 = s.toDouble ( &ok );
	myOperator = 5;

} /* modulo() */


void FCalcMethod::multiply()
{
#ifdef DEBUG
	cout << "Data:" << operand1 << " " << operand2 << " " << myOperator << endl;
#endif
	
	QString s;
	s = Display->text();
	Display->clear();
	bool ok;
	operand1 = s.toDouble ( &ok );
	myOperator = 3;

} /* multiply() */


void FCalcMethod::equals()
{
	QString s2;
	s2 = Display->text();
	
	bool ok;
	operand2 = s2.toDouble ( &ok );
	
#ifdef DEBUG
	cout << "Data:" << operand1 << " " << operand2 << " " << myOperator << endl;
#endif
	
	if ( myOperator == 1 )
		result = operand1 + operand2;
	else if ( myOperator == 2 )
		result = operand1 - operand2;
	else if ( myOperator == 3 )
		result = operand1 * operand2;
	else if ( myOperator == 4 )
		result = operand1 / operand2;
	else if ( myOperator == 5 ) {
		int a = (int) operand1;
		int b = (int) operand2;
		result = a % b;
	}
	
#ifdef DEBUG
	cout << "Data (result):" << result << endl;
#endif
	
	Display->clear();
	myString->setNum ( result, 'f', 6 );	

	Display->insert ( *myString );
	myMonitor = 1;
	operand1 = result;
	operand2 = 0;

} /* equals() */


void FCalcMethod::backSpace()
{
	Display->backspace();
} /* backSpace() */


// Prints a zero on the display panel.
void FCalcMethod::print0()
{
	if ( myMonitor == 0 )
		Display->insert ( tr ("0") );
	else if ( myMonitor == 1 ) {
		Display->clear();
		Display->insert ( tr ("0") );
		myMonitor = 0;
	}

} /* print0() */


// Prints a "1" on the display panel.
void FCalcMethod::print1()
{
	if ( myMonitor == 0 )
    		Display->insert ( tr ("1") );
	else {
		Display->clear();
		Display->insert ( tr ("1") );
		myMonitor = 0;
	}

} /* print1() */


// Prints a "2" on the display panel.
void FCalcMethod::print2()
{
	if ( myMonitor == 0 )
    		Display->insert ( tr ("2") );
	else {
		Display->clear();
		Display->insert ( tr ("2") );
		myMonitor = 0;
	}

} /* print2() */


// Prints a "3" on the display panel.
void FCalcMethod::print3()
{
	if ( myMonitor == 0 )
    		Display->insert ( tr ("3") );
	else {
		Display->clear();
		Display->insert ( tr ("3") );
		myMonitor = 0;
	}

} /* print3() */


// Prints a "4" on the display panel.
void FCalcMethod::print4()
{
	if ( myMonitor == 0 )
		Display->insert ( tr ("4") );
	else {
		Display->clear();
		Display->insert ( tr ("4") );
		myMonitor = 0;
	}

} /* print4() */


// Prints a "5" on the display panel.
void FCalcMethod::print5()
{
	if ( myMonitor == 0 )
    		Display->insert ( tr ("5") );
	else {
		Display->clear();
		Display->insert ( tr ("5") );
		myMonitor = 0;
	}

} /* print5() */


// Prints a "6" on the display panel.
void FCalcMethod::print6()
{
	if ( myMonitor == 0 )
    		Display->insert ( tr ("6") );
	else {
		Display->clear();
		Display->insert ( tr ("6") );
		myMonitor = 0;
	}

} /* print6() */


// Prints a "7" on the display panel.
void FCalcMethod::print7()
{
	if ( myMonitor == 0 )
    		Display->insert ( tr ("7") );
	else {
		Display->clear();
		Display->insert ( tr ("7") );
		myMonitor = 0;
	}

} /* print7() */


// Prints an "8" on the display panel.
void FCalcMethod::print8()
{
	if ( myMonitor == 0 )
		Display->insert ( tr ("8") );
	else {
		Display->clear();
    		Display->insert ( tr ("8") );
		myMonitor = 0;
	}

} /* print8() */


// Prints a "9" on the display panel.
void FCalcMethod::print9()
{
	if ( myMonitor == 0 )
    		Display->insert ( tr ("9") );
	else {
		Display->clear();
		Display->insert ( tr ("9") );
		myMonitor = 0;
	}

} /* print9() */


// Prints a dot if there isn't any yet.  
void FCalcMethod::printDot()
{
	if ( myMonitor == 0 )
	   	Display->insert ( tr (".") );
	else {
		Display->clear();
		Display->insert ( tr (".") );
		myMonitor = 0;
	}

} /* printDot() */


void FCalcMethod::printSign()
{
   	QString s;
	s = Display->text();
	Display->clear();
	bool ok;
	double d = s.toDouble ( &ok );
	double dd = d * -1;
	myString->setNum ( dd, 'g', 6 );
	Display->insert ( *myString);
	myMonitor = 1;
	
} /* printSign() */


void FCalcMethod::push()
{
	Display->clear();

} /* push() */