Hello!

this is the code, I wrote:

Qt Code: 
  1. #include "widget.h"
  2.  
  3. Widget::Widget(QWidget *parent)
  4.     : QWidget(parent)
  5. {
  6.     this->setGeometry(30,30,800,750);
  7.     rank = new QLineEdit("Enter the Rank", this);//rank->setGeometry(10,0,20,20);
  8.     ok = new QPushButton("Ok", this); ok->setGeometry(150, 0,80,30);
  9.     calculate = new QPushButton("calculate",this); calculate->setGeometry(250,0,80,30);
  10.  
  11.     coppy = new QTableWidgetItem;
  12.  
  13.     connect(ok,SIGNAL(clicked()),this,SLOT(ok_clicked()));
  14.     connect(calculate,SIGNAL(clicked()),this,SLOT(calculate_clicked()));
  15. }
  16.  
  17. Widget::~Widget()
  18. {
  19.  
  20. }
  21.  
  22. void Widget::ok_clicked()  
  23. {
  24.  
  25.    rank_of_Matrix = rank->text().toDouble(); 
  26.    tbl=new QTableWidget(rank_of_Matrix,rank_of_Matrix,this);
  27.    tbl->setGeometry(20,50,770,250);
  28.    tbl->show();                     
  29.  
  30.     tbl->setItem(2,2,ptwi = new QTableWidgetItem(QString::number(40)));  
  31.  
  32.  
  33.    Action_toArray(); // wrote all information into Array A[i][j] and make 0 all elements equals to zero
  34.  
  35. }
  36.  
  37. void Widget::calculate_clicked() 
  38. {
  39.     tbl  = new QTableWidget(rank_of_Matrix,rank_of_Matrix,this); 
  40.  
  41.     tbl ->setGeometry(20,350,770,250);  
  42.     tbl->setItem(2,2, coppy->clone());   
  43.     tbl ->show();                       
  44. }
  45.  
  46. void Widget::Action_toArray()
  47. {
  48.  
  49.     A= new float* [rank_of_Matrix]; 
  50.     for(int i=0;i<rank_of_Matrix;i++){
  51.         A[i]=new float [rank_of_Matrix];
  52.     }
  53.  
  54.     for(int i=0;i<rank_of_Matrix;i++){
  55.         for(int j=0;j<rank_of_Matrix;j++){
  56.              //wrote into Array from QTableWidget
  57.             A[i][j] = tbl->item(i,j)->data(Qt::DisplayRole).toFloat();
  58.         }
  59.     }
  60.  
  61. //make all elements equals to 2 
  62.     for(int i=0;i<rank_of_Matrix;i++){
  63.         for(int j=0;j<rank_of_Matrix;j++){
  64.            if(A[i][j]==2){
  65.                A[i][j]=0;
  66.            }
  67.         }
  68.     }
  69. }
To copy to clipboard, switch view to plain text mode 

My question is: how to write changed Array into Table2 after clicking button "Calculate"? Do I get it right that I need to convert float into QTableWidgetItem and then using command tbl->setItem(rank_of_Matrix,rank_of_Matrix, coppy->clone()); in loop write it into Table?

Thank you in advance!