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NAN
Not a Number; usually refers to the result of an unsuccessful floating point operation. A NaN is generated when the result of a floating-point operation cannot be represented in Institute of Electrical and Electronics Engineers (IEEE) format. To check if a floating point value is Not A Number, use the function _isnan(). NaN is also the name of a 2D game engine created by Andrei Bazhgin. View the website here.


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