### fabs -- Calculate Floating-Point Absolute Value

Format

>     #include <math.h>
>     double fabs(double x);

Language Level: ANSI, POSIX, XPG4
fabs calculates the absolute value of the floating-point argument x.

Return Value
fabs returns the absolute value. There is no error return value.

Example
This example calculates y as the absolute value of x:

    #include <math.h>
    #include <stdio.h>

    int main(void)
    {
       double x, y;

       x = -5.6798;
       y = fabs(x);

       printf("fabs( %lf ) = %lf\n", x, y);

       /***************************************
          The output should be similar to:

          fabs( -5.679800 ) = 5.679800
       ***************************************/
    }

abs -- Calculate Integer Absolute Value
_cabs -- Calculate Absolute Value of Complex Number
labs -- Calculate Absolute Value of Long Integer
<math.h>