On Wed, Jun 30, 2010 at 11:11 AM, Alastair Houghton
<alast...@alastairs-place.net> wrote:
> On 30 Jun 2010, at 15:56, Frederick Bartram wrote:
>
>> Hope that I am not being too pedantic but imo you should never test for
>> 'equality' ('==') when using machine real data types.
>
> Sometimes you really do want binary equivalence, and in that case == may be
> the right thing to use.
While we're being pedantic, note that == is not always the same as
"binary equivalence". For example, 0.0 == -0.0, and x != x when x =
NAN.
Using == can make sense when you know that your values are exact
integers, which is not an uncommon scenario, but neither is it the
usual one.
Mike
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