[jdjlist] Re: Double multiplication

[Kilkenny, Rory]

If you are referring to the1.2000000000000002E-8 where you have an actual math error, it is because double and float math don't work properly, for whatever reason.  If you switch to using BigDecimal then you are able to obtain a "better" answer. ie:       public static void main(String[] args) {           Double op1 = new Double(12.0),                 op2 = new Double(1E-9),                 res = new Double(op1.doubleValue() * op2.doubleValue());           System.out.println("op1: " + op1);         System.out.println("op2: " + op2);         System.out.println("res: " + res);           BigDecimal bd1 = new BigDecimal("12.0");         BigDecimal bd2 = new BigDecimal("1E-9");         BigDecimal res2 = bd1.multiply(bd2);           System.out.println("bd1: " + bd1);         System.out.println("bd2: " + bd2);         System.out.println("res2: " + res2);     }     results in:   op1: 12.0 op2: 1.0E-9 res: 1.2000000000000002E-8 bd1: 12.0 bd2: 0.000000001 res2: 0.0000000120   -----Original Message----- From: Ivan Bradac [mailto:[EMAIL PROTECTED]] Sent: Thursday, September 19, 2002 10:40 AM To: JDJList Subject: [jdjlist] Re: Double multiplication Sorry, the actual output was:   op1: 12.0 op2: 1.0E-9 res: 1.2000000000000002E-8 ----- Original Message ----- From: Ivan Bradac To: JDJList Sent: Thursday, September 19, 2002 4:31 PM Subject: [jdjlist] Double multiplication Hi   I have written a sample test program: .........   public static void main (String args[])      {         Double             op1 = new Double(12.0),             op2 = new Double(1E-9),             res = new Double ( op1.doubleValue()*op2.doubleValue() );                 System.out.println("op1: " + op1);         System.out.println("op2: " + op2);         System.out.println("res: " + res);     } The output is:   op1: 12.0000000001 op2: 1.0E-9 res: 1.2000000000100001E-8 What the @!# is going on?   How can I fix this?   Any help appreciated.   Thanks   Ivan To change your JDJList options, please visit: http://www.sys-con.com/java/list.cfm