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#include "main.h"
#include <QtGUI>
#include <QHBoxLayout>
#include <QtCore/qcoreevent.h>
#include <QWidget>
#include <Calculator.h>
 
 
int main(int argc, char *argv[])
{
 
    QApplication a(argc, argv);
    Calculator calkulator;
    calkulator.setWindowTitle("Calkulator");
    calkulator.resize(230,200);
  calkulator.show();
   return calkulator.exec();
}

#ifndef CALCULATOR_H
#define CALCULATOR_H
 
#include <QStack>
 
#include <QLCDNumber>
#include <QPushButton>
 
//==================================
class Calculator : public QWidget
{
    Q_OBJECT
 
private:
    QLCDNumber *lcd;
    QStack<QString> stk;
    QString disp;
 
public:
    Calculator(QWidget *wgt=0);
    QPushButton* createButton(const QString &str);
    void calculate();
 
 
public slots:
    void slotButtonCliked();
 
};
#endif // CALCULATOR_H
 

#include <Calculator.h>
#include "main.h"
#include <QtGUI>
#include <QBoxLayout>
#include <QWidget>
Calculator::Calculator(QWidget *wgt/*=0*/):QWidget(wgt)
{
 lcd=new QLCDNumber(12);
 lcd->setSegmentStyle(QLCDNumber::Flat);
 lcd->setMinimumSize(150,50);
 
 QChar buttons[4][4]={{'7','8','9','/'},
                      {'4','5','6','*'},
                      {'1','2','3','-'},
                      {'0','.','=','+'},
                     };
 
 QGridLayout *lay=new QGridLayout;
 lay->addWidget(lcd,0,0,1,4);
 lay->addWidget(createButton("CE"),1,3);
 for (int i=0; i<4; ++i)
 { for (int j=0; j<4; ++j)
     {
     lay->addWidget(createButton(buttons[i][j]),i+2,j);
     }
 }
 
 
 
 QPushButton* Calculator::createButton(QString &str)
 
 {
 QPushButton *pcmd=new QPushButton(str);
 pcmd->setMinimumSize(40,40);
 connect(pcmd, SIGNAL(clicked()), SLOT(slotButtonCliked()));
 return pcmd;
 }
 
 
 void Calculator::calculate()
 {
 double dOperand = stk.pop().toDouble();
 double dOperand2= stk.pop().toDouble();
 double dResult = 0;
 QString strOper = stk.pop();
 if (strOper=="+")
 {
    dResult=dOperand+dOperand2;
 }
 if (strOper=="-")
 {
     dResult=dOperand-dOperand2;
 }
 if (strOper=="*")
 {
     dResult=dOperand*dOperand2;
 }
 if (strOper=="/")
 {
     dResult=dOperand/dOperand2;
 }
 lcd->display(dResult);
 
 
 }
setLayout(lay);
}