erf, erff, erfl, erfc, erfcf, erfcl - error and complementary error functions

Syntax	#include <math.h> double erf(double x); C11 float erff(float x); long double erfl(long double x); (End) double erfc(double x); C11 float erfcf(float x); long double erfcl(long double x); (End)
Description	erf(), erff() and erfl() compute the error function of the floating-point number x. The error function is defined as follows: erfc(), erfcf() and erfcl() compute the complementary error function of the floating-point number x: 1.0 - erf( x ), 1.0 - erff( x ) and 1.0 - erfl( x ).
Return val.	Value of the error function of x if erf(), erff() resp. erfl() was completed successfully. Value of the complementary error function of x if erfc(), erfcf() resp. erfcl() was completed successfully.
Notes	These functions are provided due to the resulting loss of accuracy when the error functions erf(), erff() resp. erfl()are called for large values of x .
See also	math.h.