Checking for Special Floating Point Values

You can check a float or double in C# to see if it has one of the following special values: Infinity, Negative Infinity, or Not-a-Number (NaN).

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float f1 = 0.0f / 0.0f;        // NaN float f2 = 1.0f / 0.0f;        // Infinity float f3 = -1.0f / 0.0f;       // -Infinity   Console.WriteLine(float.IsNaN(f1));     // True Console.WriteLine(float.IsInfinity(f2));  // True Console.WriteLine(float.IsPositiveInfinity(f2));    // True Console.WriteLine(float.IsNegativeInfinity(f3));    // True

The float and double classes also have static fields that let you set special values directly.

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// Setting special values float f1 = float.NaN; float f2 = float.PositiveInfinity; float f3 = float.NegativeInfinity;

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