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27 .TH SCALB 3 2013-03-23 "" "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 _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
51 _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
57 _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600
61 These functions multiply their first argument
76 can be obtained by including
78 .\" not in /usr/include but in a gcc lib
80 On success, these functions return \fIx\fP * \fBFLT_RADIX\fP ** \fIexp\fP.
86 is a NaN, a NaN is returned.
90 is positive infinity (negative infinity),
93 is not negative infinity,
94 positive infinity (negative infinity) is returned.
100 is not positive infinity, +0 (\-0) is returned.
106 is positive infinity,
107 a domain error occurs, and
115 is negative infinity,
116 a domain error occurs, and
119 If the result overflows,
120 a range error occurs,
121 and the functions return
126 respectively, with a sign the same as
129 If the result underflows,
130 a range error occurs,
131 and the functions return zero, with a sign the same as
136 for information on how to determine whether an error has occurred
137 when calling these functions.
139 The following errors can occur:
141 Domain error: \fIx\fP is 0, and \fIexp\fP is positive infinity, \
142 or \fIx\fP is positive infinity and \fIexp\fP is negative infinity \
143 and the other argument is not a NaN
147 An invalid floating-point exception
151 Range error, overflow
155 An overflow floating-point exception
159 Range error, underflow
163 An underflow floating-point exception
167 These functions do not set
169 .\" FIXME . Is it intentional that these functions do not set errno?
170 .\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6803
171 .\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6804
174 is specified in POSIX.1-2001, but marked obsolescent.
175 POSIX.1-2008 removes the specification of
177 recommending the use of
185 function is from 4.3BSD.
192 is nevertheless present on several other systems
193 .\" Looking at header files: scalbf() is present on the
194 .\" BSDs, Tru64, HP-UX 11, Irix 6.5; scalbl() is on HP-UX 11 and Tru64.