problem with Qt

[deeee]

ok, thanks for these answers.
I'm not English native so I have a few difficulties to read the documentation, sorry to bother you with my questions.
I read (though quite fast) the whole page regarding the QTextEdit class but I didn't find how to access/modify the contents of the text.

Regarding the size of the table, what I mean is that sometimes some blank zones appear, and sometimes there's a need to scroll to see the contents.
Here is my code (please tell me if/how I can make it better) :

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget *fenetre = new QWidget ();
    fenetre->setFixedSize(300,600);
    QTableWidget *table = new QTableWidget(3, 2, fenetre);
    table->setFixedSize(400,400);
    table->setEditTriggers(QAbstractItemView::NoEditTriggers);
    for (int row = 0; row < 3; row++)
    {
        for  (int column = 0; column < 2; column++)
        {
            QTableWidgetItem *item = new QTableWidgetItem();
            // set the special features of each item
            item->setText("item foogyfyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy");
            table->setItem(row,column,item);
        }
    }
    fenetre->show();
    return a.exec();
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget *fenetre = new QWidget ();
    fenetre->setFixedSize(300,600);
    QTableWidget *table = new QTableWidget(3, 2, fenetre);
    table->setFixedSize(400,400);
    table->setEditTriggers(QAbstractItemView::NoEditTriggers);
    for (int row = 0; row < 3; row++)
    {
        for  (int column = 0; column < 2; column++)
        {
            QTableWidgetItem *item = new QTableWidgetItem();
            // set the special features of each item
            item->setText("item foogyfyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy");
            table->setItem(row,column,item);
        }
    }
    fenetre->show();
    return a.exec();
}

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If I do this :

QWidget *fenetre = new QWidget ();
fenetre->setFixedSize(300,600);
QTableWidget *table = new QTableWidget(3, 2, fenetre);
table->setFixedSize(200,200);

QWidget *fenetre = new QWidget ();
fenetre->setFixedSize(300,600);
QTableWidget *table = new QTableWidget(3, 2, fenetre);
table->setFixedSize(200,200);

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I get a scrollbar ;
and if I do this :

QWidget *fenetre = new QWidget ();
fenetre->setFixedSize(300,600);
QTableWidget *table = new QTableWidget(3, 2, fenetre);
table->setFixedSize(400,400);

QWidget *fenetre = new QWidget ();
fenetre->setFixedSize(300,600);
QTableWidget *table = new QTableWidget(3, 2, fenetre);
table->setFixedSize(400,400);

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or this

QWidget *fenetre = new QWidget ();
fenetre->setFixedSize(300,600);
QTableWidget *table = new QTableWidget(3, 2, fenetre);
//table->setFixedSize(200,200);

QWidget *fenetre = new QWidget ();
fenetre->setFixedSize(300,600);
QTableWidget *table = new QTableWidget(3, 2, fenetre);
//table->setFixedSize(200,200);

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I get blank zones

I guessed I'd have to do a new class to make the line count appear as well.
I have no idea how big this project is though.
Can you give me a hint ? I mean, if it takes 100 code lines to implement this feature, I will drop it. Can you help me to do it please ?

Thanks.