ldexp(3) netbsd man page | unix.com

LDEXP(3)						   BSD Library Functions Manual 						  LDEXP(3)

NAME
     ldexp, ldexpf -- multiply floating-point number by integral power of 2

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     ldexp(double x, int exp);

     float
     ldexpf(float x, int exp);

DESCRIPTION
     The ldexp() family of functions compute

	   x * 2^exp

     for a real floating-point number x.

RETURN VALUES
     The 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 +-oo, 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, depend-
		ing 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.

SEE ALSO
     frexp(3), math(3), modf(3)

STANDARDS
     The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BSD
								September 18, 2011							       BSD