Rounding float in Ruby

Question

I m having problems rounding   I have a float  which I want to round to the hundredth of a decimal   However  I can only use  round which basically turns it into an int  meaning 2 34 round     gt  2   Is there a simple effect way to do something like 2 3465     gt  2 35

User · Accepted Answer

When displaying  you can use  for example    gt  gt     2f    2 3465   gt   2 35    If you want to store it rounded  you can use    gt  gt   2 3465 100  round   100 0   gt  2 35

User · Answer

you can use this for rounding to a precison      to f is for float  salary  2921 9121 puts salary to f round 2     to 2 decimal place                     puts salary to f round      to 3 decimal place

User · Answer

You can add a method in Float Class  I learnt this from stackoverflow   class Float     def precision p            Make sure the precision level is actually an integer and  gt  0         raise ArgumentError     p  is an invalid precision level  Valid ranges are integers  gt  0   unless p class    Fixnum or p  lt  0           Special case for 0 precision so it returns a Fixnum and thus doesn t have a trailing  0         return self round if p    0           Standard case           return  self   10  p  round to f   10  p     end end

User · Answer

You can also provide a negative number as an argument to the round method to round to the nearest multiple of 10  100 and so on     Round to the nearest multiple of 10   12 3453 round -1          Output  10    Round to the nearest multiple of 100   124 3453 round -2         Output  100

User · Answer

If you just need to display it  I would use the number with precision helper  If you need it somewhere else I would use  as Steve Weet pointed  the round method

User · Answer

For ruby 1 8 7 you could add the following to your code   class Float     alias oldround round     def round precision   nil          if precision nil              return self         else             return   self   10  precision  oldround to f     10  precision          end      end  end

User · Answer

what about  2 3465 100  round   100 0

User · Answer

def rounding float precision      return   float   10  precision  round to f     10  precision  end

User · Answer

Pass an argument to round containing the number of decimal places to round to   gt  gt  2 3465 round   gt  2  gt  gt  2 3465 round 2    gt  2 35  gt  gt  2 3465 round 3    gt  2 347

[ruby-on-rails] Rounding float in Ruby

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