/* this calculates the DAC number based on the DAC and the Voltage */

#include <stdio.h> /* [f]printf */
#include <stdlib.h> /* sscanf */
#include "dac.h"

/* prints off the Ndac based on the voltage */
int main(int argc, char **argv) {
  int n;
  double Vdac, Ndac;

  /* initialize arguments */
  if(argc <= 2) { fprintf(stderr, "Usage: dac <dac> <value>\n"); return 1; }
  if(sscanf(argv[1], "%d", &n) != 1) {
    fprintf(stderr, "Ca'n't parse DAC.\n");
    return 1;
  }
  if(n < 0 || n > 1) { fprintf(stderr, "DAC out-of-bounds.\n"); return 1; }
  if(sscanf(argv[1], "%lf", &Vdac) != 1) {
    fprintf(stderr, "Ca'n't parse input Voltage.\n");
    return 1;
  }

  /* Vdac = a + (b * Ndac); */
  Ndac = (Vdac - a[n]) / b[n];
  printf("%g\n", Ndac);

  return 0;
}