/*11/20/2017
 * answers to some questions on Sample Exam 2 */

import java.util.Scanner;
/**Question VI on Sample Exam */
public class Question6 {
      public static void main(String[] args) {
        // use sentinel to tell end of data
        int idnum, miles;
        double pricePerMile;
        int numTrips=0, noDiscount=0; // 2 counters for part 6 of question
        System.out.print("Enter idnum for first trip, -1 to exit: ");
        Scanner input = new Scanner(System.in);
        idnum = input.nextInt();
        while (idnum!=-1) {
            numTrips++;
            System.out.print("Enter miles: ");
            miles = input.nextInt();
            
            System.out.print("Enter price per mile: ");
            pricePerMile = input.nextDouble();
       
            // part 2
            double basePrice=miles*pricePerMile;
            System.out.println("Base price: " + basePrice);
  
            // part 3
            double discountAmt = 0.0;
            if (miles>=20) {
               discountAmt = basePrice*.075;
               System.out.println("you get a discount of " + discountAmt 
                                    + ".");
            }
            else {
               System.out.println("You do not get a discount.");
               noDiscount++;
            }
            
            // part 4
            double finalPrice = basePrice - discountAmt;
            System.out.println("Final price is: " + finalPrice
                                 + " Discount amnt is: " + discountAmt);
            // part 5 -- repeating with while loop
            System.out.print("Enter idnum, -1 to exit: ");
            idnum = input.nextInt();               
      }      
        // part 6 is outside of the while loop
        System.out.println("Number of trips processed is: " + numTrips
                             + " non-discounted trips is: " + noDiscount++);
  }
}