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

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FPCLASSIFY(3)			   BSD Library Functions Manual 		    FPCLASSIFY(3)

NAME
     fpclassify -- classify real floating type

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <math.h>

     int
     fpclassify(real-floating x);

DESCRIPTION
     The fpclassify() macro performs classification of its argument x.	An argument represented
     in a format wider than its semantic type is converted to its semantic type first.	The clas-
     sification is then based on the type of the argument.

   IEEE 754
	   FP_INFINITE	    infinity, either positive or negative
	   FP_NAN	    not-a-number (``NaN'')
	   FP_NORMAL	    normal
	   FP_SUBNORMAL     subnormal
	   FP_ZERO	    zero

   VAX
	   FP_ROP	    reserved operand (``ROP'')
	   FP_DIRTYZERO     dirty zero
	   FP_NORMAL	    finite
	   FP_ZERO	    true zero

RETURN VALUES
     The fpclassify() macro returns the value of the number classification macro appropriate to
     its argument x as described above.

ERRORS
     No errors are defined.

SEE ALSO
     isfinite(3), isnormal(3), math(3), signbit(3)

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

BSD					 January 14, 2004				      BSD
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