##### Synopsis

    #include <math.h>
    float ldexpf(float x, int exp);

##### Description

ldexpf multiplies a floating-point number by an integral power of 2.

ldexpf returns x * 2^exp.

##### Fast math library behavior

If the result overflows, errno is set to ERANGE and ldexpf returns HUGE_VALF.

##### IEC 60559 math library behavior

If x is ? or NaN, ldexpf returns x.
If the result overflows, ldexpf returns ?.

##### Portability

ldexpf conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).