1 .\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
2 .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
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25 .TH SCALB 3 2010-09-20 "" "Linux Programmer's Manual"
27 scalb, scalbf, scalbl \- multiply floating-point number
28 by integral power of radix (OBSOLETE)
32 .BI "double scalb(double " x ", double " exp );
34 .BI "float scalbf(float " x ", double " exp );
36 .BI "long double scalbl(long double " x ", double " exp );
41 Feature Test Macro Requirements for glibc (see
42 .BR feature_test_macros (7)):
48 _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
49 _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
55 _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600
59 These functions multiply their first argument
74 can be obtained by including
76 .\" not in /usr/include but in a gcc lib
78 On success, these functions return \fIx\fP * \fBFLT_RADIX\fP ** \fIexp\fP.
84 is a NaN, a NaN is returned.
88 is positive infinity (negative infinity),
91 is not negative infinity,
92 positive infinity (negative infinity) is returned.
98 is not positive infinity, +0 (\-0) is returned.
104 is positive infinity,
105 a domain error occurs, and
113 is negative infinity,
114 a domain error occurs, and
117 If the result overflows,
118 a range error occurs,
119 and the functions return
124 respectively, with a sign the same as
127 If the result underflows,
128 a range error occurs,
129 and the functions return zero, with a sign the same as
134 for information on how to determine whether an error has occurred
135 when calling these functions.
137 The following errors can occur:
139 Domain error: \fIx\fP is 0, and \fIexp\fP is positive infinity, \
140 or \fIx\fP is positive infinity and \fIexp\fP is negative infinity \
141 and the other argument is not a NaN
145 An invalid floating-point exception
149 Range error, overflow
153 An overflow floating-point exception
157 Range error, underflow
161 An underflow floating-point exception
165 These functions do not set
167 .\" FIXME . Is it intentional that these functions do not set errno?
168 .\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6803
169 .\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6804
172 is specified in POSIX.1-2001, but marked obsolescent.
173 POSIX.1-2008 removes the specification of
175 recommending the use of
183 function is from 4.3BSD.
190 is nevertheless present on several other systems
191 .\" Looking at header files: scalbf() is present on the
192 .\" BSDs, Tru64, HP-UX 11, Irix 6.5; scalbl() is on HP-UX 11 and Tru64.