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  1. Qt
  2. QTBUG-64904

Conversion from QVariant to double is not consistent

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Details

    • Bug
    • Resolution: Done
    • Not Evaluated
    • 5.7.0
    • 5.6.1
    • Core: QString and Unicode
    • None
    • Windows 7
    • 8c2ca33073f20e1fe552bd8b5f663aec5b8a634d

    Description

      Converting a QVariant to double through "toDouble()" works differently for different values.

      Consider the following piece of code:

      QString value_1 = qs("30.45");
 QVariant variant_1(value_1);
 QString converted_value_1 = variant_1.toString();  //string value is "30.45"
 double double_value_1 = variant_1.toDouble();
 qDebug() << "Double value " << double_value_1;   

      ------------> Value printed is "30.4499999999"

      QString value_2 = qs("40.45");
 QVariant variant_2(value_2);
 QString converted_value_2 = variant_2.toString();   //string value is "40.45"
 double double_value_2 = variant_2.toDouble();
 qDebug() << "Double value " << double_value_2;

      ------------> Value printed is "40.4500000003"

      I am not sure if this conversion is platform (OS) dependent.

      I am debugging in Windows (Visual studio 13)

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            thiago Thiago Macieira
            jagathish_baktha Jagathish Bakthavatchalam
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            Dates

              Created:
              Updated:
              Resolved:

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