On Tue, Sep 23, 2008 at 08:47:15PM -0700, chromatic wrote: > On Thursday 18 September 2008 06:13:30 Patrick R. Michaud (via RT) wrote: > > When generating PIR output (e.g., from the compiler tools), we > > often need to convert a Float value into an equivalent representation > > for PIR. Unfortunately, all of the mechanisms I've looked at for > > doing this lose a lot of precision, which really isn't acceptable. > > How about 15 digits of precision? The attached patch (which requires a > reconfigure) does so. It also drops trailing zeroes, which may or may not be > what you want. It's much more precise though: > > set_p_s : 2.71828182845905 > get_repr : 2.718281828459045 > printf %g: 2.718282
The patch works very well -- I even tried it with very large (1.234e+34) and very small (1.234e-34) positive numbers and always got back a reasonable string that preserved the level of precision I was looking for. Dropping the trailing zeroes is fine (and preferred). +1 in favor of applying this patch (and updating any tests to match) -- this will _really_ improve things for PCT and Rakudo. Thanks! Pm
