Conversion to QString from int or byte return wrong val...

[FalloutST]

textedit->insertPlainText(QString.setNum(intArray[i]));

textedit->insertPlainText(QString.setNum(intArray[i]));

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or

textedit->insertPlainText(QString.number(intArray[i]));

textedit->insertPlainText(QString.number(intArray[i]));

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same with byte array do great work but in case int = 200 i.e.
it print -56

what is wrong with me?????????????