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 2017-09-15 "" "Linux Programmer's Manual"
29 scalb, scalbf, scalbl \- multiply floating-point number
30 by integral power of radix (OBSOLETE)
34 .BI "double scalb(double " x ", double " exp );
36 .BI "float scalbf(float " x ", float " exp );
38 .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\ >=\ 500
51 .\" || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
52 || /* Since glibc 2.19: */ _DEFAULT_SOURCE
53 || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
59 _XOPEN_SOURCE\ >=\ 600
60 || /* Since glibc 2.19: */ _DEFAULT_SOURCE
61 || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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
95 is a NaN, a NaN is returned.
99 is positive infinity (negative infinity),
102 is not negative infinity,
103 positive infinity (negative infinity) is returned.
109 is not positive infinity, +0 (\-0) is returned.
115 is positive infinity,
116 a domain error occurs, and
124 is negative infinity,
125 a domain error occurs, and
128 If the result overflows,
129 a range error occurs,
130 and the functions return
135 respectively, with a sign the same as
138 If the result underflows,
139 a range error occurs,
140 and the functions return zero, with a sign the same as
145 for information on how to determine whether an error has occurred
146 when calling these functions.
148 The following errors can occur:
150 Domain error: \fIx\fP is 0, and \fIexp\fP is positive infinity, \
151 or \fIx\fP is positive infinity and \fIexp\fP is negative infinity \
152 and the other argument is not a NaN
156 An invalid floating-point exception
160 Range error, overflow
164 An overflow floating-point exception
168 Range error, underflow
172 An underflow floating-point exception
176 These functions do not set
178 .\" FIXME . Is it intentional that these functions do not set errno?
179 .\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6803
180 .\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6804
182 For an explanation of the terms used in this section, see
188 Interface Attribute Value
193 T} Thread safety MT-Safe
197 is specified in POSIX.1-2001, but marked obsolescent.
198 POSIX.1-2008 removes the specification of
200 recommending the use of
208 function is from 4.3BSD.
215 is nevertheless present on several other systems
216 .\" Looking at header files: scalbf() is present on the
217 .\" BSDs, Tru64, HP-UX 11, Irix 6.5; scalbl() is on HP-UX 11 and Tru64.