c++ - What is the most effective way for float and double comparison?

Thursday, 2 November 2017

What would be the most efficient way to compare two
double or two float
values?

Simply doing this is not
correct:

bool CompareDoubles1
            (double A, double B)
{
 return A ==
            B;
}

But
something like:

bool
            CompareDoubles2 (double A, double B) 
{
 diff = A - B;

            return (diff < EPSILON) && (-diff <
            EPSILON);
}

Seems
to waste processing.

Does anyone know a smarter
float comparer?

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