How do you round a float to 2 decimal places in JRuby

Question

How do you round a float to 2 decimal places in JRuby 1 6 x   number   1 1164 number round 2     The above shows the following error   wrong number of arguments  1 for 0

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Edit After getting feedback  It seems the original solution didn t work  That s why updated the answer as one of the suggestions  def float of 2 decimal float n     float n to d round 2   truncate  to f end   Other answers may work  if you want to have rounded numbers of 2 decimal places  But  If you want to have floating point numbers with first two decimal places without rounding  Those answers won t help  So  to get a floating point number with first two decimal places  I used this technique  Doesn t work in some cases def float of 2 decimal float n    float n round 3  to s 0  3  to f end  with 5 666666666666666666666666  it will return 5 66 instead of rounded 5 67  Hope it will help someone

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to truncate a decimal I ve used the follow code    lt th gt  lt     sprintf   0 01f  prom total    gt  lt  --1dec aprox-- gt       lt   if prom    0 or total    0   gt          N E       lt   else   gt           lt    Integer  prom total  to d 10  0 1   gt  lt  --1decimal truncado-- gt       lt   end   gt           lt     prom total   gt   lt  th gt    If you want to truncate to 2 decimals  you should use Integr a 100  0 01

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Float round can take a parameter in Ruby 1 9  not in Ruby 1 8  JRuby defaults to 1 8  but it is capable of running in 1 9 mode

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sprintf    2f   number  is a cryptic  but very powerful way of formatting numbers   The result is always a string  but since you re rounding I assume you re doing it for presentation purposes anyway  sprintf can format any number almost any way you like  and lots more    Full sprintf documentation  http   www ruby-doc org core-2 0 0 Kernel html method-i-sprintf

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Try this   module Util module MyUtil        def self redondear up suma cantidad  decimales 0           unless suma present              return nil         end           if suma gt 0             resultado   suma to f cantidad              return resultado round decimales          end           return nil       end  end  end

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5 65235534  round 2     gt  5 65

[ruby] How do you round a float to 2 decimal places in JRuby?

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