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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | BUGS | SEE ALSO | COLOPHON |
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scalb(3) Library Functions Manual scalb(3)
scalb, scalbf, scalbl - scale by an integer power of radix
(OBSOLETE)
Math library (libm, -lm)
#include <math.h>
[[deprecated]] double scalb(double x, double e);
[[deprecated]] float scalbf(float x, float e);
[[deprecated]] long double scalbl(long double x, long double e);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
scalb():
_XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
scalbf(), scalbl():
_XOPEN_SOURCE >= 600
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions multiply their first argument x by FLT_RADIX
(probably 2) to the power of e, that is:
x * FLT_RADIX ** e
The definition of FLT_RADIX can be obtained by including
<float.h>.
On success, these functions return x * FLT_RADIX ** e.
If x or e is a NaN, a NaN is returned.
If x is positive infinity (negative infinity), and e is not
negative infinity, positive infinity (negative infinity) is
returned.
If x is +0 (-0), and e is not positive infinity, +0 (-0) is
returned.
If x is zero, and e is positive infinity, a domain error occurs,
and a NaN is returned.
If x is an infinity, and e is negative infinity, a domain error
occurs, and a NaN is returned.
If the result overflows, a range error occurs, and the functions
return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with a
sign the same as x.
If the result underflows, a range error occurs, and the functions
return zero, with a sign the same as x.
See math_error(7) for information on how to determine whether an
error has occurred when calling these functions.
The following errors can occur:
Domain error: x is 0, and e is positive infinity, or x is positive
infinity and e is negative infinity and the other argument is not
a NaN
errno is set to EDOM. An invalid floating-point exception
(FE_INVALID) is raised.
Range error, overflow
errno is set to ERANGE. An overflow floating-point
exception (FE_OVERFLOW) is raised.
Range error, underflow
errno is set to ERANGE. An underflow floating-point
exception (FE_UNDERFLOW) is raised.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ scalb(), scalbf(), scalbl() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
None.
scalb()
4.3BSD. Obsolescent in POSIX.1-2001; Removed in
POSIX.1-2008, recommending the use of scalbln(3),
scalblnf(3), or scalblnl(3) instead.
Before glibc 2.20, these functions did not set errno for domain
and range errors.
ldexp(3), scalbln(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-07-19 scalb(3)
Pages that refer to this page: scalbln(3), significand(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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