Write new data into QTableWidgetItem, convert float into QTableWidgetItem

[Blitzor DDD]

Yes, you are right.
And yes I enter it manually.

Problem was solved when I changed problem line to:
tbl_2->setItem(i,j, ptwi = new QTableWidgetItem(QString::number( A[i][j] )));

[d_stranz]

@BlitzorDDD: You could save yourself a lot of time and head-pounding if you used Google and looked up some of the many, many examples on how to use QTableWidget:

https://wiki.qt.io/How_to_Use_QTableWidget
http://www.codeprogress.com/cpp/libr...m=QTableWidget

and you would make many fewer mistakes if you learned how to write a good Qt application by studying the examples and tutorials on the Qt web site:

http://doc.qt.io/qt-5/qtexamplesandtutorials.html

We could spend many hours fixing each new bug you create, or you could teach yourself not to make bugs in the first place.

[Blitzor DDD]

Yes, yes, I would and I will.
This is just my third program on Qt.
Thank you very much for your links!

[anda_skoa]

Yes, you are right.
And yes I enter it manually.

Which, unsurprisingly, results in items being added to the table.
Your tbl_2, on the other hand, remains empty.

Problem was solved when I changed problem line to:
tbl_2->setItem(i,j, ptwi = new QTableWidgetItem(QString::number( A[i][j] )));

Not sure what you have the "ptwi" in there for, but yes.
As already clarified in comment #2, btw.

Cheers,
_