Java: Trap in Arithmetic II
By admin on Aug 28, 2008 in Java, Programming
What will you expect from the following code?
1: public static void main(String[] args) {
2: System.out.println(10.00-9.10) ;
3:
4: }
Instead of printing “0.90″, it prints “0.9000000000000004″ on my machine.
This is a know floating point issue with all languages. To get it correctly done in Java, you need to use BigDecimal class, passing the number as string.
1: public static void main(String[] args) {
2: System.out.println(new BigDecimal("10.00").subtract(new BigDecimal("9.10"))) ;
3:
4: }
For currency calculation, always use BigDecimal.
