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32.\" from: @(#)cos.3 5.1 (Berkeley) 5/2/91
33.\" $Id: frexp.3,v 1.4 2004/12/20 21:35:45 scp Exp $
34.\"
35.Dd December 11, 2006
36.Dt FREXP 3
37.Os
38.Sh NAME
39.Nm frexp
40.Nd break floating-point number into normalized fraction and power of 2
41.Sh SYNOPSIS
42.Fd #include <math.h>
43.Ft double
44.Fn frexp "double value" "int *exp"
45.Ft long double
46.Fn frexpl "long double value" "int *exp"
47.Ft float
48.Fn frexpf "float value" "int *exp"
49.Sh DESCRIPTION
50The
51.Fn frexp
52functions break the floating-point number
53.Fa value
54into a normalized fraction and an
55integral power of 2. They store the integer in the int object pointed to by
56.Fa exp.
57.Pp
58The functions return a number x such that x has a magnitude in the interval [1/2, 1) or 0, and
59value = x*(2**exp).
60.Sh SPECIAL VALUES
61.Fn frexp "�0" "exp"
62returns �0, and stores 0 in the object pointed to by exp.
63.Pp
64.Fn frexp "�infinity" "exp"
65returns �infinity, and stores an unspecified value in the object pointed to by exp.
66.Pp
67.Fn frexp "Nan" "exp"
68returns a Nan, and stores an unspecified value in the object pointed to by exp.
69.Sh SEE ALSO
70.Xr math 3 ,
71.Xr scalbn
72.Sh STANDARDS
73The
74.Fn frexp
75functions conform to ISO/IEC 9899:1999(E).