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

NAME
       exp, expf, expl - base-e exponential function

SYNOPSIS
       #include <math.h>

       double exp(double x);
       float expf(float x);
       long double expl(long double x);

       Link with -lm.

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

       expf(), expl():
	   _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
	   _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

DESCRIPTION
       The exp() function returns the value of e (the base  of	natural	 loga‐
       rithms) raised to the power of x.

RETURN VALUE
       On success, these functions return the exponential value of x.

       If x is a NaN, a NaN is returned.

       If x is positive infinity, positive infinity is returned.

       If x is negative infinity, +0 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.

ERRORS
       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.

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

SEE ALSO
       cbrt(3), cexp(3), exp10(3), exp2(3), sqrt(3)

COLOPHON
       This page is part of release 3.58 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/.

				  2010-09-20				EXP(3)
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