Computes the complementary error function.
#include <math.h> float erfcf (x) float x; long double erfcl (x) long double x; double erfc (x) double x;
The erfcf, erfcl, and erfc subroutines compute the complementary error function 1.0 - erf(x).
An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. Upon return, if errno is nonzero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is nonzero, an error has occurred.
| x | Specifies the value to be computed. |
Upon successful completion, the erfcf, erfcl, and erfc subroutines return the value of the complementary error function.
If the correct value would cause underflow and is not representable, a range error may occur. Either 0.0 (if representable), or an implementation-defined value is returned.
If x is NaN, a NaN is returned.
If x is ±0, +1 is returned.
If x is -Inf, +2 is returned.
If x is +Inf, +0 is returned.
If the correct value would cause underflow and is representable, a range error may occur and the correct value is returned.
feclearexcept Subroutine, fetestexcept Subroutine, and class, _class, finite, isnan, or unordered Subroutines.
math.h in AIX 5L Version 5.2 Files Reference.