Mathematical Library Functions exp2(3M)
NAME
exp2, exp2f, exp2l - exponential base 2 functions
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include
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 erroroccurs 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 callfeclearexcept(FE_ALL_EXCEPT) before calling these functions.
SunOS 5.11 Last change: 12 Jul 2006 1
Mathematical Library Functions exp2(3M)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 attri-
butes:____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Interface Stability | Committed ||_____________________________|_____________________________|
| MT-Level | MT-Safe |
|_____________________________|_____________________________|
| Standard | See standards(5). ||_____________________________|_____________________________|
SEE ALSO
exp(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), log(3M), math.h(3HEAD), attributes(5), standards(5)SunOS 5.11 Last change: 12 Jul 2006 2