ldexp man page on Archlinux

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LDEXP(3)		   Linux Programmer's Manual		      LDEXP(3)

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

       #include <math.h>

       double ldexp(double x, int exp);
       float ldexpf(float x, int exp);
       long double ldexpl(long double x, int exp);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       ldexpf(), ldexpl():
	   _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

       The  ldexp()  function  returns the result of multiplying the floating-
       point number x by 2 raised to the power exp.

       On success, these functions return x * (2^exp).

       If exp is zero, then x is returned.

       If x is a NaN, a NaN is returned.

       If x is positive infinity (negative infinity), positive infinity (nega‐
       tive infinity) is returned.

       If the result underflows, a range error occurs, and zero is returned.

       If the result overflows, a range error occurs, and the functions return
       HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with a sign  the  same
       as x.

       See  math_error(7) for information on how to determine whether an error
       has occurred when calling these functions.

       The following errors can occur:

       Range error, overflow
	      errno is set to ERANGE.  An  overflow  floating-point  exception
	      (FE_OVERFLOW) is raised.

       Range error, underflow
	      errno  is	 set to ERANGE.	 An underflow floating-point exception
	      (FE_UNDERFLOW) is raised.

   Multithreading (see pthreads(7))
       The ldexp(), ldexpf(), and ldexpl() functions are thread-safe.

       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
       4.3BSD, C89.

       frexp(3), modf(3), scalbln(3)

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

				  2013-08-19			      LDEXP(3)

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