ldexp, ldexpf, ldexpl - load exponent of floating-point number

Syntax	#include <math.h> double ldexp(double x, int exp); C11 float ldexp(float x, int exp); long double ldexpl(long double x, int exp); (End)
Description	These functions compute the quantity: x * 2exp where x is the mantissa and exp is the exponent. ldexp() is the inverse function of frexp().
Return val.	Value of x * 2exp
		if successful.
	+/-HUGE_VAL +/-HUGE_VALF +/-HUGE_VALL	depending on the function type and the sign of x, if an overflow occurs. errno is set to indicate the error.
Errors	ldexp(), ldexpf() and ldexpl() will fail if: ERANGE      Overflow.
See also	frexp(), modf(), math.h.