scalb - load exponent of a radix-independent floating-point number
#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().
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.
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, 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 and may set errno to [EDOM].
The scalb() function will fail if:
- The correct value would overflow or underflow.
The scalb() function may fail if:
- The x or n argument is NaN.