Plus (as Igor noted) -0.0 returns as 0.0. Regards, Donald Shepherd.
On Thu, 1 Aug 2019 at 08:41, Keith Medcalf <kmedc...@dessus.com> wrote: > > sqlite3_bind_double and sqlite3_column_double will round trip IEEE > floating point values EXCEPT for NaN. NaN will be stored as a NULL. > > -- > The fact that there's a Highway to Hell but only a Stairway to Heaven says > a lot about anticipated traffic volume. > > >-----Original Message----- > >From: sqlite-users [mailto:sqlite-users- > >boun...@mailinglists.sqlite.org] On Behalf Of Eric Reischer > >Sent: Wednesday, 31 July, 2019 15:15 > >To: sqlite-users@mailinglists.sqlite.org > >Subject: [sqlite] Floating point literals > > > >Is there a way to pass binary representations of floating point > >numbers to > >a SQL query? If sqlite's internal representation of floating point > >numbers is 8-byte IEEE doubles, it would be convenient to be able to > >pass > >the literal value of a float or double to the underlying SQL parser > >without suffering the quantization that occurs with printf()'ing > >floating > >point values. > > > >One way I've accomplished this in the past with other interfaces is > >to > >interpret a hex value as a binary literal that can be interpreted as > >a raw > >4-byte or 8-byte IEEE floating-point value (either via a union or > >other > >compiler trick). I understand you can *retrieve* a non-quantized > >value > >using sqlite3_column_double(), but I don't see a way to set one > >without > >having to printf() the floating point value. > > > >Can this be done using sqlite3_bind_* interfaces, or do they quantize > >as > >well? The documentation isn't clear on this. The goal is to copy > >the > >straight 8-byte (or precision-extended 4-byte) IEEE value into the > >column > >into the database (where the column is defined as a FLOAT) without > >having > >to build a SQL statement that has an obscene number of digits in each > >floating point field. > > > >Thanks in advance. > >_______________________________________________ > >sqlite-users mailing list > >sqlite-users@mailinglists.sqlite.org > >http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > > > > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
