How to get a -0 result in floating point calculations and distinguish it from +0 in C#?

Question

The MSDN documentation mentions that double type includes negative zero. However, both -1.0 / double.PositiveInfinity and -double.Epsilon / 2

Answer 1

Try this. If pz is positive zero and nz is negative zero:

Double.PositiveInfinity/pz => Double.PositiveInfinity
Double.PositiveInfinity/nz => Double.NegativeInfinity

I got this from ECMA C# specification.

You can obtain negative zero by dividing any positive number by negative infinity:

10.0/Double.NegativeInfinity