> A favorite interview question is, given this line and no other
> information, how big must buf_size be to never clip the output?
> You can assume the default 1.6 precision ("%1.6f").
> snprintf( buf, buf_size, "%f", v );
> The answer? At least 318 characters.
This is very interesting. Jay, could you explain the answer? Doesn't
%1.6f limit number of digits to print?
Pavel
On Wed, Mar 2, 2011 at 10:58 AM, Jay A. Kreibich <j...@kreibi.ch> wrote:
> On Tue, Mar 01, 2011 at 03:21:58PM +0000, David Gilbert scratched on the wall:
>
>> for(jj=0; jj<tree.nDim*2; jj++){
>> sqlite3_snprintf(512-nCell,&zCell[nCell],"
>> %f",(double)cell.aCoord[jj].f);
>>
>> That's against 3.7.4 but it looks like it's the same in the trunk.
>>
>> With that change the test suite passes. However, that %f looks a bit
>> odd a few lines below and is probably worth thinking about.
>
> Due to the way the floating point registers work on a PDP-7, in C all
> 32-bit float values are promoted to 64-bit double values when used
> in a var-arg. Hence, for output, "%f" can be safely used for both
> 32-bit and 64-bit floating point values. The tags "%f" and "%lf" are
> the same. (This isn't true for input functions such as scanf().)
>
>
>
> A favorite interview question is, given this line and no other
> information, how big must buf_size be to never clip the output?
> You can assume the default 1.6 precision ("%1.6f").
>
> snprintf( buf, buf_size, "%f", v );
>
>
>
> The answer? At least 318 characters.
>
> -j
>
> --
> Jay A. Kreibich < J A Y @ K R E I B I.C H >
>
> "Intelligence is like underwear: it is important that you have it,
> but showing it to the wrong people has the tendency to make them
> feel uncomfortable." -- Angela Johnson
> _______________________________________________
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> sqlite-users@sqlite.org
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>
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