isunordered
From cppreference.com
| Defined in header <math.h>
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| #define isunordered(x, y) /* implementation defined */ |
(since C99) | |
Determines if the floating point numbers x and y are unordered, that is, one or both are NaN and thus cannot be meaningfully compared with each other.
Parameters
| x | - | floating point value |
| y | - | floating point value |
Return value
Nonzero integral value if either x or y is NaN, 0 otherwise.