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[QUOTE="Stefan Ram, post: 2838159"]
The floating point values are represented as binary floating
  point values. /Binary/ floating point values can not exactly
  represent all values, even if those value have a short exact
  representation using the decimal system.

For example, the value of the decimal numeral »0.1« can not be
  represented as a finite binary fraction. So, when it is
  represented, the true representation with infinitely many
  binary digits needs to be abbreviated to finitely many digits.
  The error becomes visible, when such a value then is 
  converted back to a decimal representation.

public class Main
{ public static void main( final java.lang.String[] args )
  { java.lang.System.out.println( new java.math.BigDecimal( 0.1 )); }}

0.1000000000000000055511151231257827021181583404541015625

So, then, the next question to ask would be: Why does the
  following program not print
  »0.1000000000000000055511151231257827021181583404541015625«,
  but »0.1« instead?

public class Main
{ public static void main( final java.lang.String[] args )
  { java.lang.System.out.println( 0.1 ); }}

0.1
[/QUOTE]

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