Updated: 2021/Apr/14

LDEXP(3) Library Functions Manual LDEXP(3)NAMEldexp,ldexpf,ldexpl- multiply floating-point number by integral power of 2LIBRARYMath Library (libm, -lm)SYNOPSIS#include<math.h>doubleldexp(double x, int exp); floatldexpf(float x, int exp); long doubleldexpl(long double x, int exp);DESCRIPTIONTheldexp() family of functions compute x * 2^exp for a real floating-point number x.RETURNVALUESThe functions return the value of x times 2 raised to the power exp. Otherwise the following may occur: 1. If x is NaN, a NaN is returned. 2. If exp is zero or x is either +- 0 or +-<infinity>, x is returned. 3. If the call would cause an overflow, a range error occurs and either +-HUGE_VAL, +-HUGE_VALF, or +-HUGE_VALL is returned, depending on the sign of x and the type of the return value. 4. If an underflow would be caused by the correct value, and the value is not representable, either 0.0 or an implementation- defined value is returned.SEEALSOfrexp(3), math(3), modf(3)STANDARDSThe described functions conform to ISO/IEC 9899:1999 ("ISO C99"). NetBSD 9.99 March 17, 2016 NetBSD 9.99