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FPCLASSIFY(3)              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 classification 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'').

NetBSD 7.1.2                   January 14, 2004                   NetBSD 7.1.2