FYI: If you use cout, it will not give you 1e-6 precision by default.
On Sat, Apr 28, 2012 at 9:35 PM, [email protected] <[email protected]>wrote:
> You don't need to worry about outputing exactly the same as the sample
> in the case of floating point. As they say, if the number you print
> out is within 1E-5 of what is expected, then it is considered
> correct. In fact you only need one of absolute or relative
> difference, so if the number is really large you get more leeway.
>
> Assuming your algorithm is correct, you can just output the number
> with at least as many decimals as required, and printing out more
> won't hurt. I usually use 6, but 8 or even 10 would be okay. One of
> my solutions for problem C was even giving a negative 0 ("-0.000000")
> but that was judged okay as well.
>
> In short, pretty-printing floats is something you don't need to worry
> about for GCJ (unless the problem is specifically about that, of
> course).
>
> Some problems don't state it, so from the FAQ:
>
> Two floating point numbers are considered equal if their absolute or
> relative difference is smaller than 1e-6
>
> (unless otherwise stated, so in this case it was 1e-5).
>
>
>
> On Apr 28, 6:26 pm, Carlos Guia <[email protected]> wrote:
> > Use more than 5 and you're safe. Something like %.7f that way you would
> get
> > a bunch 0s and sometimes some low order decimals. But the important thing
> > is that the difference is less than 1e-5.
> >
> > Carlos Guia
> > On Apr 28, 2012 4:43 PM, "Eric Kulcyk" <[email protected]> wrote:
> >
> >
> >
> >
> >
> >
> >
> > > Hello,
> >
> > > I had a partial solution for C coded up, however I wasn't sure how to
> > > format the output correctly. The problem says the answer for be
> correct to
> > > 1E-5, but the sample output is "1.4"
> > > When I use %.5f or %f, it does 1.40000. I can get it to print 1.4 with
> > > %.2g, however 1.45 outputs as 1.5 when using %.2g. I tried to code a
> > > solution that detected how many digits were in the solution, but it
> failed
> > > for 120.000000000025 (it output 1.2e+02).
> >
> > > What's the correct way to do this?
> > > BTW, using printf in java using eclipse.
> >
> > > Thanks,
> > > Eric
> >
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