Function "round" in expressions assumes a strange behavior on negative numbers when the parameter "places" is assigned.

[qgib]

Author Name: Gabriel De Luca (@gabriel-de-luca)
Original Redmine Issue: 20861
Affected QGIS version: 3.5(master)
Redmine category:expressions
Assignee: Loïc BARTOLETTI

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Function "round" in expressions assumes a strange behavior on negative numbers when the parameter "places" is assigned.

Tested on attributes of type "Decimal number (real)".

It does not happen when applied to positive numbers or when the "places" parameter is not specified.

Tested on QGIS 3.4.2, Windows 10, with all plugins disabled or not.

[qgib]

Author Name: Loïc BARTOLETTI (@lbartoletti)

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Can you describe the problem more precisely by including the treatment involved and the expected outcome.

For my part, I observed a problem with rounding, e. g:

round(-1234.567, 2) => -1234.56 instead of -1234.57 (in comparison with postgis or python)

Is it the same problem?

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• operating_system was changed from Windows 10 to
• version was changed from 3.4.2 to 3.5(master)
• assigned_to_id was configured as Loïc BARTOLETTI
• status_id was changed from Open to Feedback

[qgib]

Author Name: Loïc BARTOLETTI (@lbartoletti)

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Applied in changeset cfdc8c2.

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• done_ratio was changed from 0 to 100
• status_id was changed from Feedback to Closed

[qgib]

Author Name: Gabriel De Luca (@gabriel-de-luca)

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Loïc BARTOLETTI wrote:

Is it the same problem?

Yes, also @round( -100.00, 1)@ returns -99.9 instead of -100.0

Thanks for fix it.