scalbnf---scale by integer
#include <math.h> double scalbn(double x, int y); float scalbnf(float x, int y);
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
x times 2 to the power n.
scalbnf is required by ANSI C or by the System V
Interface Definition (Issue 2).
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