Question

JAVA - the program should output as follows:

Please enter a seed:
2345

Please enter the size of the array:
1

Array size must be greater than 1. Please reenter:
0

Array size must be greater than 1. Please reenter:
-1

Array size must be greater than 1. Please reenter:
8

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
1

Array: 3 7 2 1 3 0 6 3

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
2

Average: 3.125

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
3

Largest: 7

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
4

3Count: 3

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
5

Less than half of first: 2

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
6

Repeats: 0

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
7

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
1

Array: 3 7 2 1 3 0 6 3

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
9

Illegal option, try again

Please choose an option:
1 Print the array
2 Find the average
3 Find the largest element
4 Count how many times 3 occurred
5 Count how many elements are less than half of the first element
6 Find how many times numbers repeat consecutively
7 Swap the first and last elements
8 Exit
8

======================================================

Your program: should be named MinilabReview.java and will create an array of (pseudo)random ints and present a menu to the user to choose what array manipulations to do.   Specifically, the program should:

• Declare constants to specify the maximum integer that the array can contain (set to 8) and the integer whose occurrances will be counted (set to 3, to be used in one of the menu options).
• Ask the user to enter a “seed” for the generation of random numbers (this is so everyone’s results will be the same, even though random).
• Ask the user what the size of the array should be. Read in the size; it should be greater than 1. Keep making the user re-enter the value as long as it is out of bounds.
• Create a new random number generator using the seed.
• Create the array and fill it in with random numbers from your random number generator.   (Everyone’s random numbers therefore array elements should be in the range 0 to and everyone’s random numbers should match).
• Show the user a menu of options (see examples that are given). Implement each option.   The output should be in the exact same format as the example. Finally, the menu should repeat until the user chooses the exit option.

Examples: Please see the MinilabReviewExample1.pdf and MinilabReviewExample2.pdf that you are given for rather long examples of running the program.   Please note:

• If you use the same seed as in an example and use the Random number generator correctly, your results should be the same as the example.
• Please be sure that the formatting is EXACT, including words, blank lines, spaces, and tabs.
• Not all of the options nor all of the error checking may have been done in a given example, so you may have to add some test cases.
• There is 1 space after each of the outputs (Array: ) or (Length: ) or (prompts)
• There are 2 spaces between each element when the array is listed

There are tabs before and after each option number when the menu is printed.

Answer 1

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

public class ArrayOperations {

    public static void printMenu() {
        System.out.println("Please choose an option:\n" +
                "1 Print the array\n" +
                "2 Find the average\n" +
                "3 Find the largest element\n" +
                "4 Count how many times 3 occurred\n" +
                "5 Count how many elements are less than half of the first element\n" +
                "6 Find how many times numbers repeat consecutively\n" +
                "7 Swap the first and last elements\n" +
                "8 Exit");
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Please enter a seed:");
        int seed = in.nextInt();
        Random random = new Random(seed);
        System.out.println("\nPlease enter the size of the array:");
        int size = in.nextInt();
        while (size <= 1) {
            System.out.println("Array size must be greater than 1. Please reenter:");
            size = in.nextInt();
        }
        int[] arr = new int[size];
        for (int i = 0; i < size; i++) {
            arr[i] = random.nextInt(10);
        }
        int choice;
        while (true) {
            printMenu();
            choice = in.nextInt();
            if (choice == 1) {
                System.out.print("Array:");
                for (int i = 0; i < size; i++) {
                    System.out.print(" " + arr[i]);
                }
                System.out.println();
            } else if (choice == 2) {
                double avg = 0;
                for (int i = 0; i < size; i++) {
                    avg += arr[i];
                }
                avg /= arr.length;
                System.out.println("Average: " + avg);
            } else if (choice == 3) {
                int max = arr[0];
                for (int i = 0; i < size; i++) {
                    if (arr[i] > max)
                        max = arr[i];
                }
                System.out.println("Largest: " + max);
            } else if (choice == 4) {
                int count = 0;
                for (int i = 0; i < size; i++) {
                    if (arr[i] == 3)
                        ++count;
                }
                System.out.println("3Count: " + count);
            } else if (choice == 5) {
                int count = 0;
                for (int i = 0; i < size; i++) {
                    if (arr[i] < arr[0]/2)
                        ++count;
                }
                System.out.println("Less than half of first: " + count);
            } else if (choice == 6) {
                int count = 0;
                for (int i = 0; i < size-1; i++) {
                    if (arr[i] == arr[i+1])
                        ++count;
                }
                System.out.println("Repeats: " + count);
            } else if (choice == 7) {
                int temp = arr[0];
                arr[0] = arr[arr.length-1];
                arr[arr.length-1] = temp;
            } else if (choice == 8){
                return;
            } else {
                System.out.println("Illegal option, try again");
            }
        }
    }
}