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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