Quick Help Needed with little App.

[Sicko]

I need to make something that converts from Celcious to:
Kelvin, Fahrenheit, Rankine, Réaumur, Newton, Rømer and Delisle.

Right now, I have the following:

void mainForm::convertClicked()
{
 double celsius_input, result = 0;
 
        celsius_input = celsiusLineEdit->text().toDouble();
 
        result = (celsius_input *  (9.0/5.0)) + 32.0;
 
       resultLineEdit->setText(QString::number(result, 'f', 1));
 
       celsiusLineEdit->clear();
}

void mainForm::convertClicked()
{
 double celsius_input, result = 0;
 
        celsius_input = celsiusLineEdit->text().toDouble();
 
        result = (celsius_input *  (9.0/5.0)) + 32.0;
 
       resultLineEdit->setText(QString::number(result, 'f', 1));
       
       celsiusLineEdit->clear();
}

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The problem is, all results have to come in that same resultLineEdit.
How do I do that?

Thanks.