/*11/20/2017
 * answer to last question using ARRAYS */

import java.util.Scanner;
/**Question VI on Sample Exam */
public class Question6Ver2 {
      public static void main(String[] args) {
        // use sentinel to tell end of data
        int[] idnum = new int[1000];
        int[] miles = new int[1000];
        double[] pricePerMile = new double[1000];
        int numTrips=0, noDiscount=0; // 2 counters for part 6 of question
        double[] basePrice = new double[1000];
        double[] finalPrice = new double[100];
        System.out.print("Enter idnum for first trip, -1 to exit: ");
        Scanner input = new Scanner(System.in);
        idnum[0] = input.nextInt();
        while (idnum[numTrips]!=-1) {
            System.out.print("Enter miles: ");
            miles[numTrips] = input.nextInt();
            
            System.out.print("Enter price per mile: ");
            pricePerMile[numTrips] = input.nextDouble();
       
            // part 2
            basePrice[numTrips]=miles[numTrips]*pricePerMile[numTrips];
            System.out.println("Base price: " + basePrice[numTrips]);
  
            // part 3
            double discountAmt = 0.0;
            if (miles[numTrips]>=20) {
               discountAmt = basePrice[numTrips]*.075;
               System.out.println("you get a discount of " + discountAmt 
                                    + ".");
            }
            else {
               System.out.println("You do not get a discount.");
               noDiscount++;
            }
            
            // part 4
            finalPrice[numTrips] = basePrice[numTrips] - discountAmt;
            System.out.println("Final price is: " + finalPrice[numTrips]
                                 + " Discount amnt is: " + discountAmt);
            numTrips++;
            // part 5 -- repeating with while loop
            System.out.print("Enter idnum, -1 to exit: ");
            idnum[numTrips] = input.nextInt();               
      }      
        // part 6 is outside of the while loop
        System.out.println("Number of trips processed is: " + numTrips
                             + " non-discounted trips is: " + noDiscount++);
  }
}