Multiply a floating-point number and an integral power of 2
float __far ldexpf(float val, int exp);
Returns the value calculated byval x 2 exp.
When val is a Not-a-Number (NaN), ldexpf returns a Not-a-Number (NaN) and sets macro EDOM to global variable errno.
If an underflow or overflow occurs as a result of executing ldexpf, it sets macro ERANGE to global variable errno. If an underflow occurs, ldexpf returns an denormal number. If an overflow occurs, it returns .
Multiply a floating-point number and an integral power of 2.