Question

1. Create a class named Program10. Your program should have the following 4 methods (other helper methods are allowed, but these four methods must be implemented as specified).
2. You need to define a global scanner object and only use it inside the main method and the getValues method, since other methods do not get any values from the input.
3. getValues:
   • This method does not have any input parameter and returns an array of integers.
   • This method prompts the user with a message and gets a positive number. Method shows “Invalid inputs” message for negative numbers and zero, and askes the user to re-enter the number. This positive number is for how many integers needs to be received from the input.
   • This method uses that positive value to get integer values from the input and saves them inside an array.
   • This method returns an array which is filled up with integer values.
   • Finish this method, test it and then start other methods since you will be calling this method from other methods.
4. alternatingSum:
   • This method does not have any input parameters.
   • This method gets an array of integers by calling geValues() method.
   • This method returns the alternating sum of all elements.
5. reverse:
   • This method gets an array of integers by calling geValues() method.
   • This method returns an array with reversed elements.
   • All reversed elements need to be displayed inside the main method.

6. Run:
   • This method does not have any input parameters.
   • This method generates 20 random dice tosses (no return value).
   • dice tosses with same number eg: 5 5 are in paranthesis (5 5)
   • 20 random dice toss pairs are printed using print statement

Output:

Inside the main method, create a menu and call all methods from the main method.

Optional: you can also create an extra method for the menu and call it inside the main method.

Submit Program10.java file on canvas.

>run Program10 PROGRAM#10 1- alternatingSum 2- reverse 3- Run 4- Exit Enter a number[1-4]: -1 Invalid input! Enter a number[1-4]: 5 Invalid input! Enter a number[1-4]: 1 ** alternatingSum ** How many integer values: 0 Invalid input! How many integer values: -2 Invalid input! How many integer values: 9 Enter the numbers: 1 4 9 16 9 7 4 9 11 The result is: 12 PROGRAM#10 1- alternatingSum 2- reverse 3- Run 4- Exit Enter a number[1-4]: 2 ** reverse ** How many integer values: 9 Enter the numbers: 1 4 9 16 9 7 4 9 11 The reverse array is: 11 9 4 7 9 16 9 4 1 PROGRAM#10 1- alternatingSum 2- reverse 3- Run 4- Exit Enter a number[1-4]: 3 ** run ** The sequence of numbers is: 1 2 (5 5) 3 1 2 4 3 (2 2 2 2) 3 6 (5 5) 6 3 1

Answer 1

package HomeworkLib1;
import java.util.Random;
import java.util.Scanner;
public class Program10 {
        static Scanner in;
        public static void printMenu() {
                System.out.println("PROGRAM#10");
                System.out.println("1 - Alternating Sum");
                System.out.println("2 - Reverse");
                System.out.println("3 - Run");
                System.out.println("4 - Exit");
        }
        public static void main(String[] args) {
                int i=0;
                int option;
                do {
                        in = new Scanner(System.in);
                        printMenu();
                        do {
                                System.out.print("Enter a number[1-4]: ");
                                option=in.nextInt();
                                if(!(option==1 || option==2|| option==3|| option==4))
                                        System.out.println("Invalid input!");
                                else
                                        break;
                        }while(true);
                        switch(option) {
                        case 1:
                                int x = alternatingSum();
                                System.out.println("The result is: " + x);
                                break;
                        case 2:
                                int[] y = reverse();
                                System.out.print("The reverse array is: ");
                                for(int m: y)
                                        System.out.print(m+" ");
                                System.out.println();
                                break;
                        case 3:
                                run();
                                break;
                        case 4:
                                System.exit(0);
                        }
                }while(true);
                
        }
        private static int[] getValues() {
                int i;
                do {
                        System.out.print("How many interger values?");
                        in = new Scanner(System.in);
                        i = in.nextInt();
                        if(i<=0) {
                                System.out.println("Invalid input!");
                                continue;
                        }
                        else
                                break;
                }while(true);
                int[] array = new int[i];
                System.out.print("Enter the numbers: ");
                for(int j=0; j<i; j++)
                        array[j]=in.nextInt();
                return array;
        }
        private static void run() {
                Random rand = new Random();
                int[] array = new int[20];
                for(int i=0; i<20; i++)
                        array[i] = rand.nextInt(6+1);
                
                for(int i: array)
                        System.out.print(i+" ");
                System.out.println();
                for(int i=0; i<20; i++) {
                                                //If there are two continuous 5's
                        if(i<19 && array[i]==5 && array[i+1]==5) {
                                System.out.print("(5 5) ");
                                i++;
                        }
                        else
                                System.out.print(array[i] + " ");
                }
                System.out.println();
        }
        private static int[] reverse() {
                int[] array = getValues();
                int j;
                int end = array.length-1;
                                //Reversing an element. Swap elements from star and end
                for(j=0 ;j<=end/2; j++) {
                        int temp = array[end-j];
                        array[end-j]=array[j];
                        array[j]=temp;
                }               
                return array;
        }
        private static int alternatingSum() {
                System.out.println("**alternatingSum");
                int[] array = getValues();
                int sum = 0;
                for(int i=0; i<array.length; i++) {
                        sum += array[i];
                        i++;                    //Skip next element
                }
                return sum;
        }

}