codice:
#include <math.h>

#define A(x) (5*pow(x, 3)+3*pow(x, 2)-(x)+16)

double result = A(4.5);
codice:
#include <math.h>

double A(double x) {
  return 5*pow(x, 3)+3*pow(x, 2)-x+16;
}

double result = A(4.5);