Question

5.4 Java Create a program that generates SuperLotto lottery numbers.

• Create a class called SuperLottoPlus.java
• Create a method called generateSuperLottoNumbers() that returns an array of 6 random SuperLotto lottery numbers.
  • The first 5 numbers must be from the range 1 to 47
  • The 6th number (the MEGA) must be from 1 to 27.
• Create a method called printTicket() that takes an integer array as an parameter
  • it will loop through the integer array and print out the data
  • Display the data in the format: 47 22 25 4 13 (MEGA: 14)
• In the main method
  • Ask the user how many lotto tickets they want.
  • If the user enters 5, for example, then using a for loop, loop 5 times.
  • In each loop iteration, call the printTicket() method, passing a call to the method generateSuperLottoNumbers() as an agrument
• Hard part: Create another method called generateSuperLottoNoDupes() which does the same thing as generateSuperLottoNumbers(), but returns an array without duplicates in the first 5 numbers. It is OK for the MEGA number to be a duplicate of any of the first 5

Example output:

How many Super Lotto tickets do you want?
4
28 8 11 9 28 MEGA (4)
38 39 29 47 27 MEGA (27)
15 17 33 12 6 MEGA (19)
30 29 18 20 31 MEGA (12)

Answer 1

import java.util.Random;
import java.util.Scanner;

class SuperLottoPlus {
   public static int[] generateSuperLottoNumbers() {
       int arr[] = new int[6];
       Random r = new Random();
       for (int i = 0; i < 5; i++)
           arr[i] = r.nextInt(47) + 1;
       arr[5] = r.nextInt(27) + 1;
       return arr;
   }

   public static void printTicket(int arr[]) {
       for (int i = 0; i < 5; i++)
           System.out.print(arr[i] + " ");
       System.out.println("(MEGA: " + arr[5] + ")");
   }

   public static int[] generateSuperLottoNoDupes() {
       int arr[] = new int[6];
       int count[] = new int[47];
       int n = 0;
       Random r = new Random();
       for (int i = 0; i < 5;) {
           n = r.nextInt(47) + 1;
           if (count[n] == 0) {
               arr[i] = n;
               count[n]++;
               i++;
           }
       }
       arr[5] = r.nextInt(27) + 1;
       return arr;
   }
}

public class SuperLottoPlusDemo {
   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       System.out.println("How many Super Lotto tickets do you want?");
       int n = sc.nextInt();
       for (int i = 0; i < n; i++)
           SuperLottoPlus.printTicket(SuperLottoPlus.generateSuperLottoNumbers());
      
       System.out.println("How many Super Lotto tickets do you want without dup?");
       n = sc.nextInt();
       for (int i = 0; i < n; i++)
           SuperLottoPlus.printTicket(SuperLottoPlus.generateSuperLottoNoDupes());
      
   }
}