I thought, that item is a function to access to element of the Table and this is not an object to create it, isn't it?

this is header-file

.h
Qt Code: 
  1. #ifndef WIDGET_H
  2. #define WIDGET_H
  3.  
  4. #include <QWidget>
  5. #include <QTableWidget>
  6. #include <QLabel>
  7. #include <QLineEdit>
  8. #include <QPushButton>
  9. #include <QTableWidgetItem>
  10.  
  11. class Widget : public QWidget
  12. {
  13.     Q_OBJECT
  14.  
  15. public:
  16.     Widget(QWidget *parent = 0);
  17.     ~Widget();
  18.  
  19. private:
  20.     QTableWidget     * tbl;         
  21.     QTableWidgetItem * ptwi = 0;
  23.     QStringList      * lst;       
  24.     QLineEdit        * rank;
  26.     QPushButton      * calculate;
  27.  
  28.     int rank_of_Matrix=1;
  29.     float x=0;
  30.     float **A;
  31.  
  32.  
  33. private slots:
  34.     void ok_clicked();
  35.     void calculate_clicked();
  36.     void Action_toArray();
  37. };
  38.  
  39. #endif // WIDGET_H
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