std::vector<QString > p;
std::vector<QString > d;
std::vector<QString > t;

void MainWindow::on_pushButton_clicked()
{
    for(size_t i=0; i<t.size(); i++)
    {
        ui->t[i]->setText(QString::number(ui->p[i].text().toDouble() + ui->d[i].text().toDouble()));
    }
}