1.52 scalbn, scalbnf, scalbln, scalblnf—scale by power of FLT_RADIX (=2)

Synopsis

     #include <math.h>
     double scalbn(double x, int n);
     float scalbnf(float x, int n);
     double scalbln(double x, long int n);
     float scalblnf(float x, long int n);
     

Description
The scalbn and scalbln functions compute x times FLT_RADIX to the power n. efficiently. The result is computed by manipulating the exponent, rather than by actually performing an exponentiation or multiplication. In this floating-point implementation FLT_RADIX=2, which makes the scalbn functions equivalent to the ldexp functions.