QT how to translate unicode to character?

Question

Qt

I've already broken my head. There is a Cyrillic character code, it needs to be displayed in qtextedit, but I do not understand how to convert it to a character.
I'm trying like this:

// Например, codeSymbol = 1040 - это "А"
ui->textEdit->insertPlainText(QString(char(codeSymbol)));
// и так
ui->textEdit->insertPlainText(QString(codeSymbol));

As a result, crooked symbols are displayed

Help

Answer 1

ui->textEdit->insertPlainText(QString(QChar(codeSymbol)));