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

function

fabs

     double fabs  (double x);      float fabsf (float x);long double fabsl (long double x);

     double fabs (double x);      float fabs (float x);long double fabs (long double x);

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

Compute absolute value

Returns the absolute value of x: |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

(defined for

being any

integral type

Parameters

x: Value whose absolute value is returned.

Return Value The absolute value of x.

Example

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

int main ()
{
  printf ("The absolute value of 3.1416 is %f\n", fabs (3.1416) );
  printf ("The absolute value of -10.6 is %f\n", fabs (-10.6) );
  return 0;
}

Output:

The absolute value of 3.1416 is 3.141600
The absolute value of -10.6 is 10.600000