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yancya/float_vs_bigdecimal.rb

Created November 25, 2013 06:53
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Float と BigDecimal の誤差の出方を比較
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float_vs_bigdecimal.rb
[1] pry(main)> (1000.times.inject(0){|sum| sum += 0.0000001})
#=> 0.00010000000000000159
[2] pry(main)> require 'bigdecimal'
#=> true
[3] pry(main)> (1000.times.inject(0){|sum| sum += BigDecimal.new("0.0000001")}).to_f
#=> 0.0001
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