1 .\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
2 .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
3 .\" <mtk.manpages@gmail.com>
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25 .TH SCALBLN 3 2008-08-11 "" "Linux Programmer's Manual"
27 scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl \-
28 multiply floating-point number by integral power of radix
32 .BI "double scalbln(double " x ", long int " exp );
34 .BI "float scalblnf(float " x ", long int " exp );
36 .BI "long double scalblnl(long double " x ", long int " exp );
38 .BI "double scalbn(double " x ", int " exp );
40 .BI "float scalbnf(float " x ", int " exp );
42 .BI "long double scalbnl(long double " x ", int " exp );
47 Feature Test Macro Requirements for glibc (see
48 .BR feature_test_macros (7)):
55 _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
61 _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
65 These functions multiply their first argument
80 can be obtained by including
82 .\" not in /usr/include but in a gcc lib
84 On success, these functions return \fIx\fP * \fBFLT_RADIX\fP ** \fIexp\fP.
88 is a NaN, a NaN is returned.
92 is positive infinity (negative infinity),
93 positive infinity (negative infinity) is returned.
97 is +0 (\-0), +0 (\-0) is returned.
99 If the result overflows,
100 a range error occurs,
101 and the functions return
106 respectively, with a sign the same as
109 If the result underflows,
110 a range error occurs,
111 and the functions return zero, with a sign the same as
116 for information on how to determine whether an error has occurred
117 when calling these functions.
119 The following errors can occur:
121 Range error, overflow
125 An overflow floating-point exception
129 Range error, underflow
133 An underflow floating-point exception
137 These functions do not set
139 .\" FIXME . Is it intentional that these functions do not set errno?
140 .\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6803
142 These functions first appeared in glibc in version 2.1.
146 These functions differ from the obsolete functions described in
148 in the type of their second argument.
149 The functions described on this page have a second argument
150 of an integral type, while those in
152 have a second argument of type
157 equals 2 (which is usual), then