/* Exercise 5.9 Solution */
#include <stdio.h>
#include <math.h>

float 
calculateCharges (float hours);

void
main ()
{
  float h, currentCharge, totalCharges = 0.0, totalHours = 0.0;
  int i, first = 1;

  printf ("Enter the hours parked for 3 cars: ");

  for (i = 1; i <= 3; i++) 
    {
      scanf ("%f", &h);
      totalHours += h;
   
      if (first) 
        {
          printf ("%5s%15s%15s\n", "Car", "Hours", "Charge");

          /* prevents the header from printing again */
          first = 0;
        }
   
      currentCharge = calculateCharges (h);
      totalCharges += currentCharge;
      printf ("%5d%15.1f%15.2f\n", i, h, currentCharge);
    }

  printf ("%5s%15.1f%15.2f\n", "TOTAL", totalHours, totalCharges);
}

float 
calculateCharges (float hours)
{
  float charge;

  if (hours < 3.0)
    charge = 2.0;
  else if (hours < 19.0)
    charge = 2.0 + .5 * ceil (hours - 3.0);
  else
    charge = 10.0;
   
  return charge;
}