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scalbn (3)
SCALB(3) Linux Programmer's Manual SCALB(3)
NAME
scalb, scalbf, scalbl, scalbn, scalbnf, scalbnl, scalbln, scalblnf,
scalblnl - multiply floating-point number by integral power of radix
SYNOPSIS
#include <math.h>
double scalb(double x, double exp);
float scalbf(float x, double exp);
long double scalbl(long double x, double exp);
double scalbn(double x, int exp);
float scalbnf(float x, int exp);
long double scalbnl(long double x, int exp);
double scalbln(double x, long int exp);
float scalblnf(float x, long int exp);
long double scalblnl(long double x, long int exp);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
scalb(), scalbf(), scalbl(): _BSD_SOURCE || _SVID_SOURCE ||
_XOPEN_SOURCE >= 500
scalbn(), scalbnf(), scalbnl(): _BSD_SOURCE || _SVID_SOURCE ||
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99
scalbln(), scalblnf(), scalblnl(): _XOPEN_SOURCE >= 600 ||
_ISOC99_SOURCE; or cc -std=c99
DESCRIPTION
These functions multiply their first argument x by FLT_RADIX (probably
2) to the power exp.
If FLT_RADIX equals 2, then scalbn() is equivalent to ldexp(3).
The value of FLT_RADIX is found in <float.h>.
CONFORMING TO
The scalb() function is from 4.3BSD. The scalbn() and scalbln() func-
tions are from C99. All three are in POSIX.1-2001. The scalb() func-
tion is marked obsolescent.
SEE ALSO
ldexp(3)
2007-07-26 SCALB(3)
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