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Showing content from https://cplusplus.com/reference/cmath/erfc/ below:

function

erfc

     double erfc  (double x);      float erfcf (float x);long double erfcl (long double x);

     double erfc (double x);      float erfc (float x);long double erfc (long double x);     double erfc (T x);           // additional overloads for integral types

Compute complementary error function

Returns the complementary error function value for x.

The complementary error function is equivalent to:

erfc(x) = 1-erf(x)

Header

<tgmath.h>

provides a type-generic macro version of this function.

Additional overloads

are provided in this header (

<cmath>

) for the

integral types

: These overloads effectively cast

to a

double

before calculations (defined for

being any

integral type

Parameters

x: Parameter for the complementary error function.

Return Value Complementary error function value for x.
If x is too large, an underflow range error occurs.

If an underflow range error occurs:

- And math_errhandling has MATH_ERRNO set: the global variable errno is set to ERANGE.
- And math_errhandling has MATH_ERREXCEPT set: FE_UNDERFLOW is raised.

Example

/* erfc example */
#include <stdio.h>      /* printf */
#include <math.h>       /* erfc */

int main ()
{
  double param, result;
  param = 1.0;
  result = erfc (param);
  printf ("erfc(%f) = %f\n", param, result );
  return 0;
}

Output:

erfc (1.000000) = 0.157299