#include <stdio.h>

#define CFL 0.5

/*********************************************************************/
/* Lax-Wendroff                                                      */
/*********************************************************************/

double get_delta(double *current){
  return *(current-1) * (0.5 * CFL * (1 + CFL))
            - *current * (CFL * CFL)
            + *(current+1) * (-0.5 * CFL * (1 - CFL));
}