`scalbn`

, `scalbnf`

---scale by integer#include <math.h> double scalbn(doublex, inty); float scalbnf(floatx, inty);

**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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