QTableWidget::item to Double?

[Afflicted.d2]

How do I convert QTableWidget::item to double?

void Method::setMatrix()
{
	for (int i = 0; i < rowCount; ++i)
	{
		for (int j = 0; j < columnCount; ++j)
		{
			a[i][j] = table->item(i, j);
		}
	}
}

void Method::setMatrix()
{
	for (int i = 0; i < rowCount; ++i)
	{
		for (int j = 0; j < columnCount; ++j)
		{
			a[i][j] = table->item(i, j);
		}
	}
}

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