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× C Standard Library


The C <math.h> erf() function is used to return the error function of the argument. The error function of x is defined as:

erf function

Error functions usually occur in probability, statistics and partial differential equation describing diffusion.

Error Function

Syntax

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

Parameters

x Specify the value.

Return Value

Returns the error function of the argument.

Example:

In the below example, erf() function is used to return the error function of the given value.

#include <stdio.h>
#include <math.h>
 
int main (){
  printf("%lf\n", erf(0));
  printf("%lf\n", erf(1));
  printf("%lf\n", erf(2));
  printf("%lf\n", erf(-1));
  printf("%lf\n", erf(-2));    
  return 0;
}

The output of the above code will be:

0.000000
0.842701
0.995322
-0.842701
-0.995322

❮ C <math.h> Library