#include <stdio.h>

/* Michael A. Redmond                        */
/* PA State Police fine calculation program  */
/* 10/20/99                                  */

/* Calculate Miles per hour */
/* Given:
 *    Number of miles
 *    Number of minutes traveled
 * Returns:
 *    MPH
 */
double calcMPH (double miles, double minutes) {

    const int minPerHour = 60;
	double mph;

	/* mph is miles per minute times 60 minutes in an hour */
    mph = (miles / minutes) * minPerHour;

    return mph;
  }

/* Calculate Fine for Driver */
/* Given:
 *    drivers speed in miles per hour
 *    speed limit in miles per hour 
 * Returns:
 *    Drivers fine - $20 base fine 
 *                   if 5 mph or less over limit, no further fine
 *                   if more than 5 and less than 10 mph over limit, 
 *                        add $2 additional for each mph over speed limit
 *                   if more than 10 and less than 20 mph over limit
 *                        add $4 additional for each mph over speed limit
 *                   extra special fine if more than 20 mph over limit -
 *                        $50 plus $5 for every mph over speed limit
 */
double calcFine (double mph, int speedLimit) {

	double overLimit;
	double fine;
	/* handle not speeding */
    if (mph <= speedLimit) {
       fine = 0;
      }
	/* determine how much over speed limit */
    overLimit = mph - speedLimit;
	/* determine if low speeding - 5 mph or less under speed limit */
	/* intentionally put .0001 on tests to deal with inexactness of floats 
	      - so if 5 is represented  as 5.000000000001 we still treat it as 5 */
    if (overLimit <= 5.0001) {
		/* low speeding */
       fine = 20;
      }
	/* determine if between 5 and 10 mph above limit */
    if (overLimit <= 10.0001) {
       fine = (20 + (2 * overLimit));
      }
	/* determine if between 10 and 20 mph above limit */
    if (overLimit <= 20.0001) {
       fine = (20 + (4 * overLimit));
      }
    else {
		/* more than 20 mph over speed limit */
       fine = (50 + (5 * overLimit));
      }
	return fine;

  }


/* print drivers bill for speeding fine */
/* Given:
 *    number of miles traveled
 *    number of minutes driving on the turnpike
 *    calculated speed in mph
 *    speed limit on stretch of turnpike travelled
 *    calculated fine for driver
 * Returns:
 *    Nothing
 * Side Effect:
 *    prints bill
 */
void printBill(double miles,double minutes,double MPH,int speedLimit,double Fine) {
    printf("\n");
    printf("===========================< CUT HERE >===============================\n");
    printf("                               Bill\n");
    printf("\n");
    printf("   You traveled %6d miles in %6.1f minutes \n",miles,minutes);
    printf("      - an average speed of %5.1f miles per hour\n",MPH);
    printf("   This compares to a speed limit of %2d \n",speedLimit);
    printf("   The fine of %7.2f has been charged to your account \n",Fine);
    printf("\n");
    printf("===========================< CUT HERE >===============================\n");
    printf("\n");
  }


/********/
/* MAIN */
/********/

int main() {

   int numCars;
   int cnt;
   double minutes;
   double miles;
   double currMPH;
   double currFine;
   int speedLimit;

   double totalMPH = 0.0;

   int numSpeeding = 0;

   double totalFines;
   double percSpeeding;
   double aveFinePerSpeeding;
   double aveFinePerCar;
   double aveMPH;


   /* executable */

   /* get how many drivers to process */
   printf("How many cars will be logged in this batch? ");
   scanf("%d",&numCars);

   printf("\n");


   /* ensure valid number of drivers */
   while (numCars <= 0) {
	   printf("Please enter a positive number of cars");
	   scanf("%d",&numCars);
     }

   /*************************************************/
   /* loop through user specified number of cars    */
   /* getting distance and time, calculating speed, */
   /* fine, and displaying bill if appropriate.     */
   /* and keep track of summary stats               */
   /*************************************************/
   for (cnt = 0;cnt < numCars; cnt++) { 

	  /* get time on turnpike and validate */
      printf("Car %2d \n",(cnt + 1));
      printf("Time on Turnpike (in minutes): ");
      scanf("%lf",&minutes);
	  while (minutes <= 0) {	   
		  printf("\nPlease enter a positive number of minutes");	   
		  scanf("%lf",&minutes);    
	  }

	  /* get miles traveled on turnpike and validate */
      printf("Miles on Turnpike: ");
      scanf("%lf",&miles);
	  while (miles <= 0) {	   
		  printf("\nPlease enter a positive number of miles");	   
		  scanf("%lf",&miles);    
	  }

	  /* get speed limit on turnpike and validate */
      printf("Speed Limit on Turnpike: ");
      scanf("%d",&speedLimit);
	  while ((speedLimit < 35) || (speedLimit > 65)) {	   
		  printf("\nPlease enter a speed limit between 35 and 65");	   
		  scanf("%d",&speedLimit);    
	  }
      printf("\n");

	  /* calculate drivers speed, update accumulator, and display speed */
      currMPH = calcMPH(miles,minutes);
      totalMPH += currMPH;
      printf("\nSpeed: %5.1f \n",currMPH);

	  /* calculate drivers fine */
      currFine = calcFine(currMPH,speedLimit);

	  /* determine if driver is to be fined */
      if (currFine > 0.0001) {
		 /* driver is to be fined - print bill, 
		  * update count of speeders, and asccumulator for fines */
         printBill(miles,minutes,currMPH,speedLimit,currFine);
         numSpeeding++;
         totalFines += currFine;
       }

   } /* end for loop */

   /* determine percent of drivers speeding */ 
   /* Take ratio and multiply by 100 to get percent */
   percSpeeding = (numSpeeding / numCars) * 100.0;

   /* calculate mean fine per speeding driver */
   /* avoid divide by 0 */
   if (numSpeeding > 0) {
	  /* there are speeders - calculate average */
      aveFinePerSpeeding = totalFines / numSpeeding;
     }
   else {
	  /* no speeders */
	  /* average is not really 0, but must display something */
      aveFinePerSpeeding = 0;
     }

   /* calculate average fine per car (all cars, speeding or not) */
   aveFinePerCar = totalFines / numCars;
   
   /* calculate average speed per car */
   aveMPH = totalMPH / numCars;

   /* final report for batch of cars */
   printf("\n");
   printf("\n\n                     Final Report\n");
   printf("                     ------------\n");

   printf("\n");
   printf(" In a batch of %2d cars %2d were speeding \n",numCars,numSpeeding); 
   printf("\n");
   printf(" This represents %6.2f percent of cars \n",percSpeeding);
   printf("\n");
   printf(" The total fines charged were %8.2f \n",totalFines);
   printf(" This represents an average per speeding car of %6.2f \n",aveFinePerSpeeding);
   printf(" OR an average for all cars of %6.2f \n",aveFinePerCar);

   printf("\n The average speed of all cars was %6.2f miles per hour \n",aveMPH);
        
   printf("\n");
   printf("Goodbye \n");

   return 0;

 }