hi,

I'm trying to make a simple program that gets integers from sliders,
and compute them.

A sample of my code :

data.h
Qt Code: 
  1. #include <QtGUI>
  2. #include <QObject>
  3.  
  4. #ifndef DATA_H
  5. #define DATA_H
  6. class Data : public QWidget
  7. {
  8.     Q_OBJECT
  9.  
  10. public:
  11.     Data(QWidget *parent = 0);
  12.  
  13. public slots:
  14.     void doSum();
  15.  
  16. private:
  17.     int Z0RealSliderValue;
  18.     int ZLRealSliderValue;
  19.  
  20.     QLineEdit *Product;
  21.  
  22. };
  23.  
  24. #endif // DATA_H
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data.cpp
Qt Code: 
  1. #include <QtGUI>
  2. #include "data.h"
  3.  
  4. Data::Data(QWidget *parent)
  5. {
  6.  
  7.     QSlider *Z0RealInput = new QSlider(Qt::Horizontal, this);
  8.     Z0RealInput->setRange(0, 150);
  9.  
  10.     QSlider *ZLRealInput = new QSlider(Qt::Horizontal, this);
  11.     ZLRealInput->setRange(0, 150);
  12.  
  13.     Z0RealSliderValue = Z0RealInput->value();
  14.     ZLRealSliderValue = ZLRealInput->value();
  15.  
  16.     Product = new QLineEdit("Sum");
  17.     Product->setReadOnly(true);
  18.  
  19.     QPushButton *Plot = new QPushButton(tr("Plot"),this);
  20.     connect(Plot, SIGNAL(clicked()), this, SLOT(doSum()));
  21.  
  22.      //layout etc etc
  23.      ....
  24.  
  25. }
  26.  
  27. void Data::doSum()
  28. {
  29.     int Sum = 0;
  30.  
  31.     Sum = ZLRealSliderValue + Z0RealSliderValue;
  32.  
  33.     Product->setText(QString::number(Sum));
  34.  
  35. }
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It kept returning 0.

I have tried to change setting the lineedit text with a constant string, and it worked,
so I assume there is nothing wrong with the connection.

Is it how I retrieve the value which make the code not working?

Thanks in advance.