NAN
From cppreference.com
Defined in header <math.h>
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#define NAN /*implementation defined*/ |
(since C99) | |
The macro NAN
expands to constant expression of type float which evaluates to a quiet not-a-number (QNaN) value. If the implementation does not support QNaNs, this macro constant is not defined.
[edit] See also
(C99)(C99)(C99) |
returns a NaN (not-a-number) (function) |
(C99) |
checks if the given number is NaN (function) |
C++ documentation for NAN
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