Rechercher une page de manuel
scalb
Langue: en
Version: 2007-07-26 (openSuse - 09/10/07)
Section: 3 (Bibliothèques de fonctions)
NAME
scalb, scalbf, scalbl, scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl - multiply floating-point number by integral power of radixSYNOPSIS
#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() functions are from C99. All three are in POSIX.1-2001. The scalb() function is marked obsolescent.SEE ALSO
ldexp(3)Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre