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Dd January 14, 2004
Dt FPCLASSIFY 3
Os
Sh NAME
Nm fpclassify
Nd classify real floating type
Sh LIBRARY
Lb libc
Sh SYNOPSIS
In math.h
Ft int
Fn fpclassify "real-floating x"
Sh DESCRIPTION
The
Fn fpclassify
macro performs classification of its argument
Fa 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.
Ss IEEE 754
Bl -tag -width "FP_SUBNORMALXXX" -compact -offset indent
It Dv FP_INFINITE
infinity, either positive or negative
It Dv FP_NAN
not-a-number
Pq Dq NaN
It Dv FP_NORMAL
normal
It Dv FP_SUBNORMAL
subnormal
It Dv FP_ZERO
zero
El
Ss VAX
Bl -tag -width "FP_DIRTYZEROXXX" -compact -offset indent
It Dv FP_ROP
reserved operand
Pq Dq ROP
It Dv FP_DIRTYZERO
dirty zero
It Dv FP_NORMAL
finite
It Dv FP_ZERO
true zero
El
Sh RETURN VALUES
The
Fn fpclassify
macro returns the value of the number classification macro appropriate
to its argument
Fa x
as described above.
Sh ERRORS
No errors are defined.
Sh SEE ALSO
Xr isfinite 3 ,
Xr isnormal 3 ,
Xr math 3 ,
Xr signbit 3
Sh STANDARDS
The
Fn fpclassify
macro conforms to
St -isoC-99 .

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