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isnan

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isnan
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Defined in header <math.h>
#define isnan(arg) /* implementation defined */
(since C99)

Determines if the given floating point number arg is not-a-number (NaN). The macro returns an integral value.

Parameters

arg - floating point value

Return value

Nonzero integral value if arg is NaN, 0 otherwise.

See also

classifies the given floating-point value
(function) [edit]
checks if the given number has finite value
(function) [edit]
(C99)
checks if the given number is infinite
(function) [edit]
checks if the given number is normal
(function) [edit]