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NetBSD 6.1.5 - man page for isnan (netbsd section 3)

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ISNAN(3)			   BSD Library Functions Manual 			 ISNAN(3)

NAME
     isnan -- test for not-a-number

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <math.h>

     int
     isnan(real-floating x);

DESCRIPTION
     The isnan() macro determines whether its argument x is not-a-number (``NaN'').  An argument
     represented in a format wider than its semantic type is converted to its semantic type
     first.  The determination is then based on the type of the argument.

   IEEE 754
     It is determined whether the value of x is a NaN.

   VAX
     NaNs are not supported.

RETURN VALUES
     The isnan() macro returns a non-zero value if the value of x is a NaN.  Otherwise 0 is
     returned.

SEE ALSO
     fpclassify(3), isfinite(3), isinf(3), isinff(3), isnanf(3), isnormal(3), math(3), signbit(3)

     IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.

STANDARDS
     The isnan() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').

BSD					  March 5, 2004 				      BSD
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