It is not a good idea to use the == operator for doubles. If you really
need to do something like that you should use a tolerance, more or less
like this:
double tol = 0.000001;
if (Math.Abs(a - b - 0.1) > tol) {
// etc.
}
At 03:15 PM 2/22/2000 +0800, you wrote:
>Sorry for posting this off-topic question here, but since people in this list
>have most probably coded extensively with Java, I'm hoping somebody can
>provide
>some insights. In my java program, an expression like the following
>evaluates
>to false:
> (0.7 - 0.6 == 0.1)
>
>The following code snipplet:
> double a = 0.7;
> double b = 0.6;
> double c = a - b;
> System.out.println("a=" + a + " b=" + b + " c=" + c);
>gives the result:
> a=0.7 b=0.6 c=0.09999999999999998
>
>Why is the result of the above operation not exact? If this is the expected
>behaviour, what would be a good way to handle such numeric operations and
>comparisons, e.g. when we're doing data validation?
>
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