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  1. #!/usr/bin/env ruby
  2. finish = ARGV[0] ? Float(ARGV[0]) : 2.0
  3. format = ARGV[1] ? ARGV[1] : '%.17g'
  4. d = finish / 2
  5. f = d
  6. 54.times do
  7.   s = format % d
  8.   puts "#{s} == #{"%a" % d}"
  9.   raise "'#{s}'.to_f != #{"%a" % d}" if s.to_f != d
  10.   exit 0 if d == finish
  11.   f /= 2
  12.   d += f
  13. end
  14.  
Success #stdin #stdout 0.05s 9656KB
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stdin
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Standard input is empty
stdout
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1 == 0x1p+0
1.5 == 0x1.8p+0
1.75 == 0x1.cp+0
1.875 == 0x1.ep+0
1.9375 == 0x1.fp+0
1.96875 == 0x1.f8p+0
1.984375 == 0x1.fcp+0
1.9921875 == 0x1.fep+0
1.99609375 == 0x1.ffp+0
1.998046875 == 0x1.ff8p+0
1.9990234375 == 0x1.ffcp+0
1.99951171875 == 0x1.ffep+0
1.999755859375 == 0x1.fffp+0
1.9998779296875 == 0x1.fff8p+0
1.99993896484375 == 0x1.fffcp+0
1.999969482421875 == 0x1.fffep+0
1.9999847412109375 == 0x1.ffffp+0
1.9999923706054688 == 0x1.ffff8p+0
1.9999961853027344 == 0x1.ffffcp+0
1.9999980926513672 == 0x1.ffffep+0
1.9999990463256836 == 0x1.fffffp+0
1.9999995231628418 == 0x1.fffff8p+0
1.9999997615814209 == 0x1.fffffcp+0
1.9999998807907104 == 0x1.fffffep+0
1.9999999403953552 == 0x1.ffffffp+0
1.9999999701976776 == 0x1.ffffff8p+0
1.9999999850988388 == 0x1.ffffffcp+0
1.9999999925494194 == 0x1.ffffffep+0
1.9999999962747097 == 0x1.fffffffp+0
1.9999999981373549 == 0x1.fffffff8p+0
1.9999999990686774 == 0x1.fffffffcp+0
1.9999999995343387 == 0x1.fffffffep+0
1.9999999997671694 == 0x1.ffffffffp+0
1.9999999998835847 == 0x1.ffffffff8p+0
1.9999999999417923 == 0x1.ffffffffcp+0
1.9999999999708962 == 0x1.ffffffffep+0
1.9999999999854481 == 0x1.fffffffffp+0
1.999999999992724 == 0x1.fffffffff8p+0
1.999999999996362 == 0x1.fffffffffcp+0
1.999999999998181 == 0x1.fffffffffep+0
1.9999999999990905 == 0x1.ffffffffffp+0
1.9999999999995453 == 0x1.ffffffffff8p+0
1.9999999999997726 == 0x1.ffffffffffcp+0
1.9999999999998863 == 0x1.ffffffffffep+0
1.9999999999999432 == 0x1.fffffffffffp+0
1.9999999999999716 == 0x1.fffffffffff8p+0
1.9999999999999858 == 0x1.fffffffffffcp+0
1.9999999999999929 == 0x1.fffffffffffep+0
1.9999999999999964 == 0x1.ffffffffffffp+0
1.9999999999999982 == 0x1.ffffffffffff8p+0
1.9999999999999991 == 0x1.ffffffffffffcp+0
1.9999999999999996 == 0x1.ffffffffffffep+0
1.9999999999999998 == 0x1.fffffffffffffp+0
2 == 0x1p+1
https://ideone.com/RVRwGy
language:
Ruby (ruby 2.5.5)
created:
9 years ago
visibility:
public

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