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exp(3M)			Mathematical Library Functions		       exp(3M)

NAME
       exp, expf, expl - exponential function

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double exp(double x);

       float expf(float x);

       long double expl(long double x);

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

RETURN VALUES
       Upon  successful	 completion,  these  functions	return the exponential
       value of x.

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

       If x is NaN, a NaN is returned.

       If x is ±0, 1 is returned.

       If x is +Inf, x is returned.

       For exceptional cases, matherr(3M) tabulates the values to be  returned
       by exp() as specified by SVID3 and XPG3. See standards(5).

ERRORS
       These functions will fail if:

       Range Error    The result overflows.

		      If    the	  integer   expression	 (math_errhandling   &
		      MATH_ERREXCEPT) is non-zero, the overflow floating-point
		      exception is raised.

		      The  exp()  function  sets errno to ERANGE if the result
		      overflows.

USAGE
       An application wanting to check for exceptions should  call  feclearex‐
       cept(FE_ALL_EXCEPT)  before  calling  these  functions.	On  return, if
       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
       non-zero,  an  exception	 has been raised. An application should either
       examine the return value or check the floating point exception flags to
       detect exceptions.

       An application can also set errno to 0 before calling exp(). On return,
       if errno is non-zero, an error has  occurred.  The  expf()  and	expl()
       functions do not set errno.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       feclearexcept(3M), fetestexcept(3M), isnan(3M), log(3M), math.h(3HEAD),
       matherr(3M), mp(3MP), attributes(5), standards(5)

SunOS 5.11			  12 Jul 2006			       exp(3M)
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