1 .\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
2 .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
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27 .TH SCALB 3 2021-03-22 "" "Linux Programmer's Manual"
29 scalb, scalbf, scalbl \- multiply floating-point number
30 by integral power of radix (OBSOLETE)
35 .BI "double scalb(double " x ", double " exp );
36 .BI "float scalbf(float " x ", float " exp );
37 .BI "long double scalbl(long double " x ", long double " exp );
43 Feature Test Macro Requirements for glibc (see
44 .BR feature_test_macros (7)):
50 .\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
51 || /* Since glibc 2.19: */ _DEFAULT_SOURCE
52 || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
59 || /* Since glibc 2.19: */ _DEFAULT_SOURCE
60 || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
63 These functions multiply their first argument
78 can be obtained by including
80 .\" not in /usr/include but in a gcc lib
82 On success, these functions return
93 is a NaN, a NaN is returned.
97 is positive infinity (negative infinity),
100 is not negative infinity,
101 positive infinity (negative infinity) is returned.
107 is not positive infinity, +0 (\-0) is returned.
113 is positive infinity,
114 a domain error occurs, and
122 is negative infinity,
123 a domain error occurs, and
126 If the result overflows,
127 a range error occurs,
128 and the functions return
133 respectively, with a sign the same as
136 If the result underflows,
137 a range error occurs,
138 and the functions return zero, with a sign the same as
143 for information on how to determine whether an error has occurred
144 when calling these functions.
146 The following errors can occur:
148 Domain error: \fIx\fP is 0, and \fIexp\fP is positive infinity, \
149 or \fIx\fP is positive infinity and \fIexp\fP is negative infinity \
150 and the other argument is not a NaN
154 An invalid floating-point exception
158 Range error, overflow
162 An overflow floating-point exception
166 Range error, underflow
170 An underflow floating-point exception
174 For an explanation of the terms used in this section, see
182 Interface Attribute Value
187 T} Thread safety MT-Safe
194 is specified in POSIX.1-2001, but marked obsolescent.
195 POSIX.1-2008 removes the specification of
197 recommending the use of
205 function is from 4.3BSD.
212 is nevertheless present on several other systems
213 .\" Looking at header files: scalbf() is present on the
214 .\" BSDs, Tru64, HP-UX 11, Irix 6.5; scalbl() is on HP-UX 11 and Tru64.
217 .\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=6803
218 .\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=6804
219 these functions did not set
221 for domain and range errors.