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

NAME

       exp, expf, expl - exponential function

SYNOPSIS

       cc [ 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 feclearexcept(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 5.10							    1 Nov 2003								   exp(3M)