man scalb (Fonctions bibliothèques) - scalb, scalbf, scalbl, scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl - multiply floating-point number by integral power of radix
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.
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().
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 1003.1-2003. The scalb() function is marked obsolescent.