QString to double convertion problem

[NoRulez]

Hi @all,

i have a QLineEdit and want the text converted to a double, so I do:

lineEdit->setText("123456789");
QVariant val = lineEdit->text().toDouble();
qDebug() << val;
.
.
.
lineEdit2->setText(val.toString());

lineEdit->setText("123456789");
QVariant val = lineEdit->text().toDouble();
qDebug() << val;
.
.
.
lineEdit2->setText(val.toString());

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Now the output would be: QVariant(double, 1.23457e+08)
And also the value in lineEdit2 is "1.23457e+08"

How can I avoid the exponentials?

Thanks in advance

Best Regards
NoRulez

[borisbn]

lineEdit->setText("123456789");
QVariant val = lineEdit->text().toDouble();
qDebug() << val; // <--- QDebug::operator<< can't format doubles as 123.45
.
.
.
const int precision = 2;
lineEdit2->setText( QString( "%1 ).arg( val.toDouble(), 0, 'f', precision ) );

lineEdit->setText("123456789");
QVariant val = lineEdit->text().toDouble();
qDebug() << val; // <--- QDebug::operator<< can't format doubles as 123.45
.
.
.
const int precision = 2;
lineEdit2->setText( QString( "%1 ).arg( val.toDouble(), 0, 'f', precision ) );

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[ChrisW67]

Don't rely on the default behaviour of QVariant::toString() if you don't like its output. As a variation to borisbn's approach, you could use QString::number() and choose the 'f' format and a number desired figures after the decimal point.
BTW: If you want to convert to a double why do you convert to a QVariant?

lineEdit->setText("12345678");
    bool ok;
    double d = lineEdit->text().toDouble(&ok);
     if (ok) {
        qDebug() << QString::number(d, 'f', 6);
        qDebug() << QString::number(d, 'f', 2);
        qDebug() << QString::number(d, 'f', 0);
    }

lineEdit->setText("12345678");
    bool ok;
    double d = lineEdit->text().toDouble(&ok);
     if (ok) {
        qDebug() << QString::number(d, 'f', 6);
        qDebug() << QString::number(d, 'f', 2);
        qDebug() << QString::number(d, 'f', 0);
    }

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[NoRulez]

@ChrisW67: Because the QVariant is in my example a model