Question

Respond to the following in a minimum of 175 words:

• Describe how you would create a Java program for creating a lottery program using arrays and methods. If the user wants to purchase 5 lottery tickets, which looping structure would you use and why? Include the necessary code and code descriptions.

Answer 1

As the question requires, we need to use the arrays for the lottery system. then for obtaining the lottery number, we are to use the Random class to generate the random/lottery number. This program requires the use of various methods, for example, to check whether a ticket is available or not, or to check if the user wor or not. The working code for this question is:

import java.io.PrintStream;
import java.util.*;

public class Test {
    private static int[] ticketNumber;
    private static int[] usersTickets;
    public static void main(String[] args) {
        ticketNumber = new int[100];
        for(int i=0; i<100; i++){
            ticketNumber[i] = i+1;
        }
        Scanner sc = new Scanner(System.in);
        System.out.println("Welcome to the Lottery game.\n---------------------------------------------------------");
        System.out.println("How many tickets would you like to draw: ");
        int n = sc.nextInt();
        usersTickets = new int[n];
        int i=0;
        while (i < n) {
            System.out.println("Enter number for ticket " + (i+1)+ ": ");
            int num = sc.nextInt();
            if (num <= ticketNumber.length) {
                if (isAvailable(ticketNumber, num)) {
                    ticketNumber = removeFromArray(ticketNumber, num);
                    System.out.println("good you have taken ticket numbered "+num);
                    usersTickets[i] = num;
                    i++;
                }
                else
                    System.out.println("Ticket number not available!");
            }
            else {
                System.out.println("This much tickets not available. Enter a smaller number: ");
            }
        }

        System.out.println("Getting the lottery draw........................");
        int luckyNo = luckyNumber();
        System.out.println("The lucky number is "+luckyNo);
        int result = didYouWin(usersTickets, luckyNo);
        if(result != 0)
            System.out.println("Congratulations!!! Yoy won the lottery on ticket "+luckyNo);
        else
            System.out.println("Better luck next time!!!!");
    }

    public static int didYouWin(int[] yourTickets, int luckyNo){
        for(int i = 0; i<yourTickets.length; i++){
            if(yourTickets[i]==luckyNo){
                return i;
            }
        }
        return 0;
    }

        public static int luckyNumber () {
            Random rand = new Random();
            return rand.nextInt(100) + 1;
        }

        public static boolean isAvailable ( int[] arr, int num){
            for (int i = 0; i < arr.length; i++) {
                if (arr[i] == num)
                    return true;
            }
            return false;
        }

        public static int[] removeFromArray ( int[] arr, int num){
            int[] newArray = new int[arr.length - 1];
            for( int i=0, k=0; i<newArray.length; i++){
                if(arr[i] == num){
                    continue;
                }
                newArray[k++] = arr[i];
            }
            return newArray;
        }
    }