How to round the double value to 2 decimal points

Question

Possible Duplicate    round double to two decimal places in java       I want to round up the double value upto 2 decimal points   for example  I have  double d 2  and the result should be result  2 00

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I guess that you need a formatted output    System out printf    2f  d

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public static double addDoubles double a  double b            BigDecimal A   new BigDecimal a                BigDecimal B   new BigDecimal b                return A add B  setScale 2  BigDecimal ROUND HALF UP  doubleValue

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Math round number 100 0  100 0

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This would do it        public static void main String   args            double d   12 349678          int r    int  Math round d 100           double f   r   100 0         System out println f            You can short this method  it s easy to understand that s why I have written like this

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double RoundTo2Decimals double val                DecimalFormat df2   new DecimalFormat                    return Double valueOf df2 format val

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import java text DecimalFormat   public class RoundTest       public static void main String   args            double i   2              DecimalFormat twoDForm   new DecimalFormat    00            System out println twoDForm format i            double j 3 1          System out println twoDForm format j            double k 4 144456          System out println twoDForm format k

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There s no difference in internal representation between 2 and 2 00  You can use Math round to round a value to the nearest integer - to make that round to 2 decimal places you could multiply by 100  round  and then divide by 100  but you shouldn t expect the result to be exactly 2dps  due to the nature of binary floating point arithmetic   If you re only interested in formatting a value to two decimal places  look at DecimalFormat - if you re interested in a number of decimal places while calculating you should really be using BigDecimal  That way you ll know that you really are dealing with decimal digits  rather than  the nearest available double value    Another option you may want to consider if you re always dealing with two decimal places is to store the value as a long or BigInteger  knowing that it s exactly 100 times the  real  value - effectively storing cents instead of dollars  for example

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you can also use this code     public static double roundToDecimals double d  int c            int temp    int  d   Math pow 10   c         return   double temp  Math pow 10   c         It gives you control of how many numbers after the point are needed     d   number to round     c   number of decimal places     think it will be helpful

[java] How to round the double value to 2 decimal points?

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