#include <math.h>double scalb(double x, double n);
The scalb() function computes x * rn, where r is the radix of the machine's floating point arithmetic. When r is 2, scalb() is equivalent to ldexp(3C).
Upon successful completion, the scalb() function returns x * rn.
If the correct value would overflow, scalb() returns ±HUGE_VAL (according to the sign of x) and sets errno to ERANGE.
If the correct value would underflow to 0.0, scalb() returns 0 and sets errno to ERANGE.
The scalb() function returns x when x is ±Inf.
If x or n is NaN, then scalb() returns NaN.
For exceptional cases, matherr(3M) tabulates the values to be returned as dictated by Standards other than XPG4.
An application wishing to check for error situations should set errno to 0 before calling scalb(). If errno is non-zero on return, or the return value is NaN, an error has occurred.
See attributes(5) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|