fabs()                   Calculate Absolute Value of Floating-Point Value
 
 #include   <math.h>
 
 double     fabs(x);
 double     x;                           Floating-point value
 
    fabs() returns the absolute value of the double 'x'.
 
    Returns:    The absolute value of 'x'. There is no error return.
 
  -------------------------------- Example ---------------------------------
 
    The following statements calculate the absolute values of -15.7, 0.0
    and 4.66e-3.
 
         #include <math.h>        /* Required for declaration only */
 
         main()
         {
             double x, y, z;
 
             x = fabs(-15.7);     /* x = 15.7 */
             y = fabs(0.0);       /* y = 0.0 */
             z = fabs(4.66e-3);   /* z = 4.66e-3 (0.00466) */
         }

Seealso:


 ceil() 
 fmod()