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    Command:

    erfcf

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double erfc(double x);
           float erfcf(float x);
           long double erfcl(long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           erfc():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           erfcf(), erfcl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The erfc() function returns the complementary error function of x, that
           is, 1.0 - erf(x).
    
    
    

    RETURN VALUE

           On success, these functions return the complementary error function  of
           x, a value in the range [0,2].
    
           If x is a NaN, a NaN is returned.
    
           If x is +0 or -0, 1 is returned.
    
           If x is positive infinity, +0 is returned.
    
           If x is negative infinity, +2 is returned.
    
           If  the  function  result  underflows  and  produces an unrepresentable
           value, the return value is 0.0.
    
           If the function result underflows but produces a  representable  (i.e.,
           subnormal) value, that value is returned, and a range error occurs.
    
    
    

    ERRORS

           See  math_error(7) for information on how to determine whether an error
           has occurred when calling these functions.
    
           The following errors can occur:
    
           Range error: result underflow (result is subnormal)
                  An underflow floating-point exception (FE_UNDERFLOW) is  raised.
    
           These functions do not set errno.
    
    
    

    SEE ALSO

           cerf(3), erf(3), exp(3)
    
    
    

    GNU 2013-10-29 ERFC(3)

    
    
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