Idea for sorting values from QLineEdits?

[high_flyer]

You are confusing all kinds of stuff, and you clearly have no understanding of how basic variable deceleration works.
You should really first learn basic programming concepts, and C syntax before you start programming with C++ and Qt.

your original code could not even compile!

QList<double> list;
        for(int i = 0; i < Num; ++i) {
           list << in[i]->text().toDouble(&ok);
        }
 
     qSort(list.begin(), list.end(), qGreater<double>());
        for(int i = 0; i < Num; ++i){
        in[i]->setText( QString::number(list.at(i)));
       }

QList<double> list;
        for(int i = 0; i < Num; ++i) {
           list << in[i]->text().toDouble(&ok);
        }

     qSort(list.begin(), list.end(), qGreater<double>());
        for(int i = 0; i < Num; ++i){
        in[i]->setText( QString::number(list.at(i)));
       }

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[ewwen]

Hi high_flyer, thanks for your help! Now everything runs and I finally understood the problem...

I´m still learning to programme and not everything I try, I find in books or tutorials. You are a professional and I am a beginner.

[high_flyer]

ewwen, that is ok to learn, everyone was a beginner once.
But you are tackling Qt, which prerequisites C++ knowledge, where as you are still in your first steps with C/C++ syntax and principals, thus doing anything with Qt will only make it more difficult.
You should first concentrate on C/C++, and once you are comfortable with the language and basic concepts, you will find Qt very helpful.
Otherwise you will find Qt hard confusing and frustrating.