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Re: Fucking sprintf rounding - how does it work?

by daxim (Chaplain)
on Sep 03, 2012 at 16:38 UTC ( #991473=note: print w/replies, xml ) Need Help??


in reply to F***ing sprintf rounding - how does it work?

round towards even, and for me, 0.15 => 0.2.

In the cases where your test program deviates from the expected value, it's just the usual floating point inaccuracy bullshit. I guess sprintf %f operates on NV/numbers.

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Re^2: Fucking sprintf rounding - how does it work?
by ribasushi (Monk) on Sep 03, 2012 at 17:07 UTC
    Could you please get the output of this on your CPU?
      Certainly.
      $ perl -e'printf qq[%s => %.68f => %.1f\n], (qq[0.${_}5]) x 3 for (0.. +9)' 0.05 => 0.050000000000000000000677626357803440271254658000543713569641 +11328125 => 0.1 0.15 => 0.150000000000000000005421010862427522170037264004349708557128 +90625000 => 0.2 0.25 => 0.250000000000000000000000000000000000000000000000000000000000 +00000000 => 0.2 0.35 => 0.349999999999999999994578989137572477829962735995650291442871 +09375000 => 0.3 0.45 => 0.449999999999999999989157978275144955659925471991300582885742 +18750000 => 0.4 0.55 => 0.550000000000000000010842021724855044340074528008699417114257 +81250000 => 0.6 0.65 => 0.649999999999999999978315956550289911319850943982601165771484 +37500000 => 0.6 0.75 => 0.750000000000000000000000000000000000000000000000000000000000 +00000000 => 0.8 0.85 => 0.850000000000000000021684043449710088680149056017398834228515 +62500000 => 0.9 0.95 => 0.949999999999999999989157978275144955659925471991300582885742 +18750000 => 0.9

      $ perl -V

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