opensolaris man page for exp2f

exp2(3M)						  Mathematical Library Functions						  exp2(3M)

NAME
       exp2, exp2f, exp2l - exponential base 2 functions

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

       double exp2(double x);

       float exp2f(float x);

       long double exp2l(long double x);

DESCRIPTION
       These functions compute the base-2 exponential of x.

RETURN VALUES
       Upon successful completion, these functions return 2^x.

       If  the	correct  value would cause overflow, a range error occurs and exp2(), exp2f(), and exp2l() return the value of the macro 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, +0 is returned.

       If x is +Inf, x is returned.

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  will	be
		      raised.

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.

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

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

SunOS 5.11							    12 Jul 2006 							  exp2(3M)