Manipulating and comparing floating points in java

Posted by Praneeth on Stack Overflow See other posts from Stack Overflow or by Praneeth
Published on 2010-05-24T09:42:53Z Indexed on 2010/05/24 10:21 UTC
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In Java the floating point arithmetic is not represented precisely. For example following snippet of code

            float a = 1.2; 
            float b= 3.0;
            float c = a * b; 
            if(c == 3.6){
              System.out.println("c is 3.6");
            } else {
                System.out.println("c is not 3.6");
            } 

actually prints "c is not 3.6".

I'm not interested in precision beyond 3 decimals (#.###). How can I deal with this problem to multiply floats and compare them reliably?

Thanks much

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