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  1. Qt
  2. QTBUG-47192

[REG 5.4.2->5.5,0] Conversion from QVariant to QString is broken for double and float values

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    • Icon: Bug Bug
    • Resolution: Invalid
    • Icon: P1: Critical P1: Critical
    • None
    • 5.5.0
    • Core: QString and Unicode
    • None
    • Windows 8.1 x64; MSVC 2013 Community; Qt x32;

      Here is an example:

      #include <QCoreApplication>
#include <QDebug>

int main(int argc, char *argv[])
{
	QCoreApplication a(argc, argv);
	QVariant v = 800.79f;
	QVariant v2 = 800.79;

	qDebug() << v << v.type() << v.toString();
	qDebug() << v2 << v2.type() << v2.toString();

	return a.exec();
}

      Output with Qt 5.4.2: 

      QVariant(float, 800.79) "800.79"
QVariant(double, 800.79) "800.79"

      Output with Qt 5.5.0: 

      QVariant(float, 800.79) "800.789978"
QVariant(double, 800.79) "800.78999999999996"

      I write finance app and get data from database using QSqlQuery+QSqlRecord classes which convert DB's numeric fields into QMetaType::Double and this is pretty critical for me.

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            thiago Thiago Macieira
            aas AAS
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              Created:
              Updated:
              Resolved:

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