_isnan (Windows CE 5.0)
Developing an Application > Microsoft C Run-time Library for Windows CE > Run-time Library Reference
Checks given double-precision floating-point value for not a number (NaN).
int _isnan( doublex);
Parameters
- x
Double-precision floating-point value.
Return Values
_isnan returns a nonzero value if the argument x is a NaN; otherwise it returns 0.
Remarks
The _isnan function tests a given double-precision floating-point value x, returning a nonzero value if x is a NaN.
A NaN is generated when the result of a floating-point operation cannot be represented in Institute of Electrical and Electronics Engineers (IEEE) format.
For information about how a NaN is represented for output, see printf.
Requirements
OS Versions: Windows CE 2.0 and later.
Header: stdlib.h.
Link Library: coredll.dll.
See Also
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