Hi all, > > p.39 Number constants > > > For hexadecimal notation, isn't there something > > about the sign that deserves mention here? > > The example uses 0X08000000 - the first 0 after the X does serve some > > purpose. > > Aage, do you know about that "something"? If yes, would you write > about it?
I think he's referring to this: http://www.firebirdsql.org/file/documentation/reference_manuals/reference_material/html/langrefupd25-hexnumerals.html, especially the information under 'Value ranges'. The line under Number Constants (in the LangRef beta): "For BIGINT numbers, hexadecimal notation is supported by Firebird 2.5 and higher versions, e.g., 0X080000000 as the hex representation of decimal 2147483648." should be: "Hexadecimal notation is supported by Firebird 2.5 and higher versions. Numbers with 1-8 hex digits (e.g. 0x325708) are parsed as INTEGER values, numbers with 9-16 hex digits (e.g. 0x198723457237) as BIGINT." More explanation about the value ranges and some pitfalls (see link above) can be given in Data Types and Subtypes :: Integer Data Types, before the start of the subsections. Also (I should have caught this during reviewing), in Data Types and Subtypes :: Integer Data Types :: INTEGER, there should be a similar sentence as under BIGINT, explaining that you can pass INTEGERs in hex notation. As for SMALLINT: Strictly speaking, you can't write a SMALLINT in hex notation, because even 0x1 is parsed as an INTEGER. But you can supply any value between 0 and 32767 in hex notation (0x0000 - 0x7FFF) wherever a SMALLINT is required and it will be converted automatically. You can also pass negative smallint values, but that's trickier: you have to write them as 0xFFFF8000 (negative INTEGER -32768) through 0xFFFFFFFF (negative INTEGER -1). In a "true SMALLINT" hex notation, this would be 0x8000 - 0xFFFF. Cheers, Paul ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785351&iu=/4140 _______________________________________________ Firebird-docs mailing list Firebird-docs@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/firebird-docs
