scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl - multiply floating-point number by integral power of radix
#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)):
These functions multiply their first argument x by
FLT_RADIX (probably 2) to the power of exp,
that is:
x * FLT_RADIX ** expThe definition of FLT_RADIX can be obtained by
including <float.h>.
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 (negative 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
return zero, with a sign the same as x.