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scalbn, scalbnf---scale by integer

Synopsis 
#include <math.h>
double scalbn(double x, int y);
float scalbnf(float x, int y);
Description
scalbn and scalbnf scale x by n, returning x times 2 to the power n. The result is computed by manipulating the exponent, rather than by actually performing an exponentiation or multiplication.


Returns
x times 2 to the power n.


Portability
Neither scalbn nor scalbnf is required by ANSI C or by the System V Interface Definition (Issue 2).


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