1 .\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
2 .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
3 .\" <mtk.manpages@gmail.com>
5 .\" %%%LICENSE_START(VERBATIM)
6 .\" Permission is granted to make and distribute verbatim copies of this
7 .\" manual provided the copyright notice and this permission notice are
8 .\" preserved on all copies.
10 .\" Permission is granted to copy and distribute modified versions of this
11 .\" manual under the conditions for verbatim copying, provided that the
12 .\" entire resulting derived work is distributed under the terms of a
13 .\" permission notice identical to this one.
15 .\" Since the Linux kernel and libraries are constantly changing, this
16 .\" manual page may be incorrect or out-of-date. The author(s) assume no
17 .\" responsibility for errors or omissions, or for damages resulting from
18 .\" the use of the information contained herein. The author(s) may not
19 .\" have taken the same level of care in the production of this manual,
20 .\" which is licensed free of charge, as they might when working
23 .\" Formatted or processed versions of this manual, if unaccompanied by
24 .\" the source, must acknowledge the copyright and authors of this work.
27 .TH SCALBLN 3 2013-06-21 "" "Linux Programmer's Manual"
29 scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl \-
30 multiply floating-point number by integral power of radix
34 .BI "double scalbln(double " x ", long int " exp );
36 .BI "float scalblnf(float " x ", long int " exp );
38 .BI "long double scalblnl(long double " x ", long int " exp );
40 .BI "double scalbn(double " x ", int " exp );
42 .BI "float scalbnf(float " x ", int " exp );
44 .BI "long double scalbnl(long double " x ", int " exp );
49 Feature Test Macro Requirements for glibc (see
50 .BR feature_test_macros (7)):
58 _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
59 _POSIX_C_SOURCE\ >=\ 200112L;
69 _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
70 _POSIX_C_SOURCE\ >=\ 200112L;
77 These functions multiply their first argument
92 can be obtained by including
94 .\" not in /usr/include but in a gcc lib
96 On success, these functions return
105 is a NaN, a NaN is returned.
109 is positive infinity (negative infinity),
110 positive infinity (negative infinity) is returned.
114 is +0 (\-0), +0 (\-0) is returned.
116 If the result overflows,
117 a range error occurs,
118 and the functions return
123 respectively, with a sign the same as
126 If the result underflows,
127 a range error occurs,
128 and the functions return zero, with a sign the same as
133 for information on how to determine whether an error has occurred
134 when calling these functions.
136 The following errors can occur:
138 Range error, overflow
142 An overflow floating-point exception
146 Range error, underflow
150 An underflow floating-point exception
154 These functions do not set
156 .\" FIXME . Is it intentional that these functions do not set errno?
157 .\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6803
159 These functions first appeared in glibc in version 2.1.
161 .SS Multithreading (see pthreads(7))
170 functions are thread-safe.
174 These functions differ from the obsolete functions described in
176 in the type of their second argument.
177 The functions described on this page have a second argument
178 of an integral type, while those in
180 have a second argument of type
185 equals 2 (which is usual), then