## Linux and UNIX Man Pages

Test Your Knowledge in Computers #193
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# OpenSolaris 2009.06(opensolaris section 3m)man page for exp

```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 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			   |
+-----------------------------+-----------------------------+