1.\" Copyright (c) 1991, 1993
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" This code is derived from software contributed to Berkeley by
5.\" the American National Standards Committee X3, on Information
6.\" Processing Systems.
7.\"
8.\" Redistribution and use in source and binary forms, with or without
9.\" modification, are permitted provided that the following conditions
10.\" are met:
11.\" 1. Redistributions of source code must retain the above copyright
12.\" notice, this list of conditions and the following disclaimer.
13.\" 2. Redistributions in binary form must reproduce the above copyright
14.\" notice, this list of conditions and the following disclaimer in the
15.\" documentation and/or other materials provided with the distribution.
16.\" 3. All advertising materials mentioning features or use of this software
17.\" must display the following acknowledgement:
18.\" This product includes software developed by the University of
19.\" California, Berkeley and its contributors.
20.\" 4. Neither the name of the University nor the names of its contributors
21.\" may be used to endorse or promote products derived from this software
22.\" without specific prior written permission.
23.\"
24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34.\" SUCH DAMAGE.
35.\"
36.\" @(#)frexp.3 8.1 (Berkeley) 6/4/93
37.\"
38.Dd June 4, 1993
39.Dt FREXP 3
40.Os
41.Sh NAME
42.Nm frexp
43.Nd convert floating-point number to fractional and integral components
44.Sh SYNOPSIS
45.Fd #include <math.h>
46.Ft double
47.Fn frexp "double value" "int *exp"
48.Sh DESCRIPTION
49The
50.Fn frexp
51function breaks a floating-point number into a normalized
52fraction and an integral power of 2.
53It stores the integer in the
54.Em int
55object pointed to by
56.Fa exp .
57.Sh RETURN VALUES
58The
59.Fn frexp
60function returns the value
61.Em x ,
62such that
63.Em x
64is a
65.Em double
66with magnitude in the interval
67.Bq 1/2 , 1
68or zero, and
69.Fa value
70equals
71.Em x
72times 2 raised to the power
73.Fa *exp .
74If
75.Fa value
76is zero, both parts of the result are zero.
77.Sh SEE ALSO
78.Xr ldexp 3 ,
79.Xr math 3 ,
80.Xr modf 3
81.Sh STANDARDS
82The
83.Fn frexp
84function conforms to
85.St -ansiC .
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" This code is derived from software contributed to Berkeley by
5.\" the American National Standards Committee X3, on Information
6.\" Processing Systems.
7.\"
8.\" Redistribution and use in source and binary forms, with or without
9.\" modification, are permitted provided that the following conditions
10.\" are met:
11.\" 1. Redistributions of source code must retain the above copyright
12.\" notice, this list of conditions and the following disclaimer.
13.\" 2. Redistributions in binary form must reproduce the above copyright
14.\" notice, this list of conditions and the following disclaimer in the
15.\" documentation and/or other materials provided with the distribution.
16.\" 3. All advertising materials mentioning features or use of this software
17.\" must display the following acknowledgement:
18.\" This product includes software developed by the University of
19.\" California, Berkeley and its contributors.
20.\" 4. Neither the name of the University nor the names of its contributors
21.\" may be used to endorse or promote products derived from this software
22.\" without specific prior written permission.
23.\"
24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34.\" SUCH DAMAGE.
35.\"
36.\" @(#)frexp.3 8.1 (Berkeley) 6/4/93
37.\"
38.Dd June 4, 1993
39.Dt FREXP 3
40.Os
41.Sh NAME
42.Nm frexp
43.Nd convert floating-point number to fractional and integral components
44.Sh SYNOPSIS
45.Fd #include <math.h>
46.Ft double
47.Fn frexp "double value" "int *exp"
48.Sh DESCRIPTION
49The
50.Fn frexp
51function breaks a floating-point number into a normalized
52fraction and an integral power of 2.
53It stores the integer in the
54.Em int
55object pointed to by
56.Fa exp .
57.Sh RETURN VALUES
58The
59.Fn frexp
60function returns the value
61.Em x ,
62such that
63.Em x
64is a
65.Em double
66with magnitude in the interval
67.Bq 1/2 , 1
68or zero, and
69.Fa value
70equals
71.Em x
72times 2 raised to the power
73.Fa *exp .
74If
75.Fa value
76is zero, both parts of the result are zero.
77.Sh SEE ALSO
78.Xr ldexp 3 ,
79.Xr math 3 ,
80.Xr modf 3
81.Sh STANDARDS
82The
83.Fn frexp
84function conforms to
85.St -ansiC .