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

function

erf

     double erf  (double x);      float erff (float x);long double erfl (long double x);

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

Compute error function

Returns the error function value for 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 error function.

Return Value Error function value for x.

Example

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

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

Output:

erf (1.000000) = 0.842701