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scalbln(3) Library Functions Manual scalbln(3)
NAME
scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl - multiply float-
ing-point number by integral power of radix
LIBRARY
Math library (libm, -lm)
SYNOPSIS
#include <math.h>
double scalbln(double x, long exp);
float scalblnf(float x, long exp);
long double scalblnl(long double x, long exp);
double scalbn(double x, int exp);
float scalbnf(float x, int exp);
long double scalbnl(long double x, int exp);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
scalbln(), scalblnf(), scalblnl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
scalbn(), scalbnf(), scalbnl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
These functions multiply their first argument x by FLT_RADIX (probably
2) to the power of exp, that is:
x * FLT_RADIX ** exp
The definition of FLT_RADIX can be obtained by including <float.h>.
RETURN VALUE
On success, these functions return x * FLT_RADIX ** exp.
If x is a NaN, a NaN is returned.
If x is positive infinity (negative infinity), positive infinity (nega-
tive infinity) is returned.
If x is +0 (-0), +0 (-0) 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 re-
turn zero, with a sign the same as x.
ERRORS
See math_error(7) for information on how to determine whether an error
has occurred when calling these functions.
The following errors can occur:
Range error, overflow
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.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
+--------------------------------------------+---------------+---------+
|Interface | Attribute | Value |
+--------------------------------------------+---------------+---------+
|scalbn(), scalbnf(), scalbnl(), scalbln(), | Thread safety | MT-Safe |
|scalblnf(), scalblnl() | | |
+--------------------------------------------+---------------+---------+
STANDARDS
C11, POSIX.1-2008.
HISTORY
glibc 2.1. C99, POSIX.1-2001.
HISTORY
These functions differ from the obsolete functions described in
scalb(3) in the type of their second argument. The functions described
on this page have a second argument of an integral type, while those in
scalb(3) have a second argument of type double.
NOTES
If FLT_RADIX equals 2 (which is usual), then scalbn() is equivalent to
ldexp(3).
BUGS
Before glibc 2.20, these functions did not set errno for range errors.
SEE ALSO
ldexp(3), scalb(3)
Linux man-pages 6.04 2023-03-30 scalbln(3)
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