round up to 2 decimal places in java

Question

I have read a lot of stackoverflow questions but none seems to be working for me  i am using math round   to round off  this is the code   class round      public static void main String args          double a   123 13698      double roundOff   Math round a 100  100       System out println roundOff         the output i get is  123 but i want it to be 123 14  i read that adding  100 100 will help but as you can see i didn t manage to get it to work   it is absolutely essential for both input and output to be a double   it would be great great help if you change the line 4 of the code above and post it

User · Answer

String roundOffTo2DecPlaces float val        return String format    2f   val

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BigDecimal a   new BigDecimal  123 13698    BigDecimal roundOff   a setScale 2  BigDecimal ROUND HALF EVEN   System out println roundOff

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seems like you are hit by integer arithmetic  in some languages  int   int  will always be evaluated as integer arithmetic  in order to force floating-point arithmetic  make sure that at least one of the operands is non-integer   double roundOff   Math round a 100  100 f

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Try    class round  public static void main String args      double a   123 13698  double roundOff   Math round a 100  100  String format    3f   roundOff       3f defines decimal precision you want System out println roundOff

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double roundOff   Math round a 100  100    should be   double roundOff   Math round a 100  100D    Adding  D  to 100 makes it Double literal  thus result produced will have precision

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double d   2 34568       DecimalFormat f   new DecimalFormat     00         System out println f format d

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This is long one but a full proof solution  never fails  Just pass your number to this function as a double  it will return you rounding the decimal value up to the nearest value of 5   if 4 25  Output 4 25  if 4 20  Output 4 20  if 4 24  Output 4 20  if 4 26  Output 4 30  if you want to round upto 2 decimal places then use  DecimalFormat df   new DecimalFormat          roundToMultipleOfFive Double valueOf df format number       if up to 3 places  new DecimalFormat            if up to n places  new DecimalFormat    nTimes       public double roundToMultipleOfFive double x                                 x input nextDouble                    String str String valueOf x                   int pos 0                  for int i 0 i lt str length   i                                          if str charAt i                                                      pos i                          break                                                           int after Integer parseInt str substring pos 1 str length                      int Q after 5                  int R  after 5                   if  Q 2   0                                        after after-R                                    else                                      if 5-R  5                                            after after                                          else after after  5-R                                             return Double parseDouble str substring 0 pos 1  concat String valueOf after

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Go back to your code  and replace 100 by 100 00 and let me know if it works  However  if you want to be formal  try this   import java text DecimalFormat  DecimalFormat df new DecimalFormat  0 00    String formate   df format value    double finalValue    Double df parse formate

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I know this is 2 year old question but as every body faces a problem to round off the values at some point of time I would like to share a different way which can give us rounded values to any scale by using BigDecimal class  Here we can avoid extra steps which are required to get the final value if we use    DecimalFormat  0 00   or using Math round a   100    100    import java math BigDecimal   public class RoundingNumbers       public static void main String args             double number   123 13698          int decimalsToConsider   2          BigDecimal bigDecimal   new BigDecimal number           BigDecimal roundedWithScale   bigDecimal setScale 2  BigDecimal ROUND HALF UP           System out println  Rounded value with setting scale     roundedWithScale            bigDecimal   new BigDecimal number           BigDecimal roundedValueWithDivideLogic   bigDecimal divide BigDecimal ONE decimalsToConsider BigDecimal ROUND HALF UP           System out println  Rounded value with Dividing by one     roundedValueWithDivideLogic              This program would give us below output  Rounded value with setting scale   123 14 Rounded value with Dividing by one   123 14

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I just modified your code  It works fine in my system  See if this helps  class round      public static void main String args          double a   123 13698      double roundOff   Math round a 100  100 00       System out println roundOff

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Well this one works     double roundOff   Math round a   100 0    100 0    Output is  123 14   Or as  Rufein said    double roundOff    double  Math round a   100    100    this will do it for you as well

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public static float roundFloat float in        return   int   in 100f  0 5f   100f      Should be ok for most cases  You can still changes types if you want to be compliant with doubles for instance

[java] round up to 2 decimal places in java?

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