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OpenSolaris 2009.06 - man page for exp2l (opensolaris section 3m)

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

exp2, exp2f, exp2l - exponential base 2 functions
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double exp2(double x); float exp2f(float x); long double exp2l(long double x);
These functions compute the base-2 exponential of x.
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.
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.
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.
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+
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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