#1,096 – Floating Point NaN Values

We’ve seen that floating point numbers can represent approximations of real number values, positive and negative zero values, and positive and negative infinity.

A floating point variable or memory location can also represent a value that is “Not a Number”, normally denoted by the keyword NaN.  A NaN value is a floating point value that is a result of a calculation that leads to a value that is not a real number or a positive or negative infinity value.

NaN values are used when it’s useful to capture the fact that a calculation led to a value that is not a valid numerical result.

Below are some examples of calculations that can lead to NaN values.  Note that we can use float.IsNaN to check for this value.

            float zeroOverZero = 0.0f / 0.0f;
            float zeroTimesInfinity = 0.0f * float.PositiveInfinity;
            float InfinityCalc = float.PositiveInfinity + float.NegativeInfinity;

            double rootNegOne = Math.Sqrt(-1.0);

1096-001

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #1,096 – Floating Point NaN Values

  1. Pingback: Dew Drop – May 14, 2014 (#1776) | Morning Dew

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