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void Calculator::sommatoria(){ //sommatoria del valore inserito per i che va da 0....operando
    Button *clickedButton = qobject_cast<Button *>(sender());
    QString clickedoperator = clickedButton->text();
    //when this operator is clicked, it is not executed immediately.I Save current operation as a possible pending operation

    double operand = display->text().toDouble(); // saving operand from display
    if (!pendingaddictionoperator.isEmpty()) {  //if there are pending operators
          if (!calculate(operand,pendingaddictionoperator)) { //if some circumstances abort
            abortOperation();
            return;
          }
           display->setText(QString::number(totalsum)); //else display new totalsum (calcolated with "calculate")
    } else {  //if there are NO pending operators
        totalsum = operand;
    }

    pendingaddictionoperator = clickedoperator;
    waitingForOperand = true;
}