/*
 */
package cis119.pkg09loops;
import java.util.Scanner;

/**
 *
 * @author AChapin
 */
public class WhileExamples {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        
        // basic while loop
        // keep halving d until we get down to 0 (note integer division)
        int d = 23;
        int t = 1;
        while (d != 0) {
            System.out.println("Try #" + t + ": " + d);
            d = d /2;
            t++;
        }
        
        
        // while loop to find average
        // asks if user wants to continue each time
        int sum = 0;
        int count = 0;
        int x;
        String ans;
        System.out.println("Do you have a number for me?");
        ans = scan.next();
        // check if most recent answer was y
        while (ans.equals("y")) {
            System.out.println("What is the first number?");
            x = scan.nextInt();
            // one more number read in
            count++;
            // add newest number to sum
            sum += x;
            // get new answer, possibly changing condition
            System.out.println("Do you have another number for me?");
            ans = scan.next();
        } 
        // get and print the average
        System.out.println("average: " + (double)sum/count);
  

        // same thing with a sentinel value
        sum = 0;
        count = 0;
        x = 0;
        int STOP = -989;
        while (x != STOP){
            System.out.println("Enter a number, " + STOP + " to stop.");
            x = scan.nextInt();
            // don't want to add sentinel value into our average
            if (x != STOP) {
                count++;
                sum += x;
            }
        }
        
        System.out.println("average: " + (double)sum/count);    



              
        // for user input
        int choice = 0;
        int choice2 = 0;
        // ke3ep track of total price
        double price = 0;
        System.out.println("Welcome to LiveStockMart!");
        //outer menu loop, ends if they enter 3
        while (choice != 3) {
            // show choices and get user input
            System.out.println("1. See total");
            System.out.println("2. Buy stuff");
            System.out.println("3. Check out");
            choice = scan.nextInt();
            // what to do depends which choice they entered
            
            // see total price
            if (choice == 1) {
                System.out.println("Current total is: $" + price);
            // buy stuff
            } else if (choice == 2) {
                choice2 = 0; // reset so we can start the loop again fresh
                //inner loop for buying stuff menu, ends if they enter 3
                // (back to outer loop)
                while (choice2 != 3) {
                    // show choices and get user input
                    System.out.println("1. Buy Chickens");
                    System.out.println("2. Buy Elephant");
                    System.out.println("3. Return to Main Menu");
                    choice2 = scan.nextInt();
                    // what to do depends which choice they entered
                    
                    // buy some number of chickens
                    if (choice2 == 1) {
                        System.out.println("How many chickens? ($10 per chicken)");
                        int numChickens = scan.nextInt();
                        price += numChickens * 10;
                        System.out.println(numChickens + " chickens purchased!");
                    // buy an elephant
                    } else if (choice2 == 2) {
                        price += 1000;
                        System.out.println("1 elephant purchased ($1000)");
                    }
                }// end inner loop, now we're back in the main loop
            }
            
        }// end outer loop        
    }
}