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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 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.

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)
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