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EXP(P)			   POSIX Programmer's Manual			EXP(P)

NAME
       exp, expf, expl - exponential function

SYNOPSIS
       #include <math.h>

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

DESCRIPTION
       These functions shall compute the base- e exponential of x.

       An  application	wishing to check for error situations should set errno
       to zero and  call  feclearexcept(FE_ALL_EXCEPT)	before	calling	 these
       functions.   On return, if errno is non-zero or fetestexcept(FE_INVALID
       | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error  has
       occurred.

RETURN VALUE
       Upon  successful	 completion, these functions shall return the exponen‐
       tial value of x.

       If the correct value would cause overflow, a range  error  shall	 occur
       and  exp(),  expf(),  and  expl()  shall	 return the value of the macro
       HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively.

       If the correct value would cause underflow, and is not representable, a
       range error may occur, and    either 0.0 (if supported), or   an imple‐
       mentation-defined value shall be returned.

       If x is NaN, a NaN shall be returned.

       If x is ±0, 1 shall be returned.

       If x is -Inf, +0 shall be returned.

       If x is +Inf, x shall be returned.

       If the correct value would cause underflow,  and	 is  representable,  a
       range error may occur and the correct value shall be returned.

ERRORS
       These functions shall fail if:

       Range Error
	      The result overflows.

       If  the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
       then errno  shall  be  set  to  [ERANGE].  If  the  integer  expression
       (math_errhandling  &  MATH_ERREXCEPT)  is  non-zero,  then the overflow
       floating-point exception shall be raised.

       These functions may fail if:

       Range Error
	      The result underflows.

       If the integer expression (math_errhandling & MATH_ERRNO) is  non-zero,
       then  errno  shall  be  set  to	[ERANGE].  If  the  integer expression
       (math_errhandling & MATH_ERREXCEPT) is  non-zero,  then	the  underflow
       floating-point exception shall be raised.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       Note  that  for IEEE Std 754-1985 double, 709.8 < x implies exp( x) has
       overflowed. The value x < -708.4 implies exp( x) has underflowed.

       On  error,  the	expressions  (math_errhandling	 &   MATH_ERRNO)   and
       (math_errhandling  & MATH_ERREXCEPT) are independent of each other, but
       at least one of them must be non-zero.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       feclearexcept() , fetestexcept() , isnan() , log() , the	 Base  Defini‐
       tions  volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error
       Conditions for Mathematical Functions, <math.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003				EXP(P)
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