Missing zero in exponential format

[EMStegehuis]

Since our upgrade from qt 5.3.1 to 5.7.0 it seems that the output of the exponential format is missing the leading zero:

Using the code below:
double testValue = 1234.5678;
QString (" <Value>%1</value>\n").arg (testValue, 0, 'E', 2);

I expect:
<Value>1.23E+03</value>
but get:
<Value>1.23E+3</value>

Has anyone a clue how this could be solved?

Regards,

Marcel

[JKSH]

Hi,

@EMStegehuis said in Missing zero in exponential format:

Since our upgrade from qt 5.3.1 to 5.7.0 it seems that the output of the exponential format is missing the leading zero:

Using the code below:
double testValue = 1234.5678;
QString (" <Value>%1</value>\n").arg (testValue, 0, 'E', 2);

I expect:
<Value>1.23E+03</value>
but get:
<Value>1.23E+3</value>

Has anyone a clue how this could be solved?

I can reproduce this.

• Qt 5.4.2 (MSVC2013 32-bit) produces "<Value>1.23E+03</value>"
• Qt 5.8.0 (MinGW 5.3.0) produces "<Value>1.23E+3</value>"

It looks like the behaviour has changed between versions. I'm not sure if this was intentional or not.

Would you be willing to raise this at the Interest mailing list? (http://lists.qt-project.org/mailman/listinfo/interest ) -- subscribe and then post there. Qt's engineers are active on that list.

[EMStegehuis]

Thiago Macieira responded to the request on the mailing list. It most likely has its origin in a change to using the double conversion library as of QT 5.7 over sprintf.

See: http://lists.qt-project.org/pipermail/interest/2017-March/026409.html

Thanks for the responses.

Marcel