ldexp

   Returns its first argument multiplied by 2 raised to the power of
   its second argument; that is, x(2n).

   Format

     #include  <math.h>

     double ldexp  (double x, int n);

     float ldexp  (float x, int n); (Integrity servers, Alpha)

     long double ldexp  (long double x, int n);                     
                        (Integrity servers, Alpha)
 

Additional information available:

Arguments       Return_Values