Inserting Items in QTableWidget

i have simple problem in inserting items in QTableWidget
this my code

Code:

QList<QString> list;
    list<<"Name"<<"Age"<<"Address";
    ui->tableWidget->setColumnCount(3);
    ui->tableWidget->setHorizontalHeaderLabels(list);
    ui->tableWidget->setRowCount(5);
 
    //for(int i=0;i<5;i++)
    //{
        QTableWidgetItem *item=new QTableWidgetItem;
        item->setText("Mahmoud");
        ui->tableWidget->setItem(0,0,item);
        item->setText("26");
        ui->tableWidget->setItem(0,1,item);
        item->setText("Alexandria");
        ui->tableWidget->setItem(0,2,item);
    //}

it doesn's insert but in first cell(0,0)
i don't know why ??