RAD Studio VCL Reference
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Math.NaN Constant
Math | Description | See Also
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NaN represents a value that cannot be represented as a valid number.

Pascal
NaN = 0.0 / 0.0;
C++
NaN = 0.0 / 0.0;
File
Description

NaN is literally defined as 0.0/0.0 : an undefined value.

Note: Only use NaN in assignments : use IsNan.
 

See Also
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