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2 .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
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27 .TH SCALBLN 3 2021-03-22 "" "Linux Programmer's Manual"
29 scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl \-
30 multiply floating-point number by integral power of radix
35 .BI "double scalbln(double " x ", long " exp );
36 .BI "float scalblnf(float " x ", long " exp );
37 .BI "long double scalblnl(long double " x ", long " exp );
39 .BI "double scalbn(double " x ", int " exp );
40 .BI "float scalbnf(float " x ", int " exp );
41 .BI "long double scalbnl(long double " x ", int " exp );
47 Feature Test Macro Requirements for glibc (see
48 .BR feature_test_macros (7)):
55 _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
56 || /* Since glibc 2.19: */ _DEFAULT_SOURCE
63 _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
64 || /* Since glibc 2.19: */ _DEFAULT_SOURCE
65 || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
68 These functions multiply their first argument
83 can be obtained by including
85 .\" not in /usr/include but in a gcc lib
87 On success, these functions return
96 is a NaN, a NaN is returned.
100 is positive infinity (negative infinity),
101 positive infinity (negative infinity) is returned.
105 is +0 (\-0), +0 (\-0) is returned.
107 If the result overflows,
108 a range error occurs,
109 and the functions return
114 respectively, with a sign the same as
117 If the result underflows,
118 a range error occurs,
119 and the functions return zero, with a sign the same as
124 for information on how to determine whether an error has occurred
125 when calling these functions.
127 The following errors can occur:
129 Range error, overflow
133 An overflow floating-point exception
137 Range error, underflow
141 An underflow floating-point exception
145 These functions first appeared in glibc in version 2.1.
147 For an explanation of the terms used in this section, see
155 Interface Attribute Value
163 T} Thread safety MT-Safe
169 C99, POSIX.1-2001, POSIX.1-2008.
171 These functions differ from the obsolete functions described in
173 in the type of their second argument.
174 The functions described on this page have a second argument
175 of an integral type, while those in
177 have a second argument of type
182 equals 2 (which is usual), then
188 .\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=6803
189 these functions did not set