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    <p>Scope of num variable is in main method only.either pass it as an argument or make it global. And please refer to java tutorials.</p> <blockquote> <p><strong>WITH NUM AS ARGUEMENT</strong></p> </blockquote> <pre><code>package com; import java.util.Scanner; public class WorkSheet_1 { //static int[] num = new int[3]; public static void main(String[] args) { //call for input System.out.println("Please Enter a 3-digit number.."); Scanner in = new Scanner(System.in); int[] num = new int[3]; for(int i = 0; i &lt; num.length; i++){ int val = in.nextInt(); num[i] = val; } System.out.println("The Sum of the numbers is " + sumNums(num)); System.out.println("The Reverse of the numbers is " + reverseNums(num)); } public static int sumNums(int[] num) { return num[0] + num[1] + num[2]; } public static int reverseNums(int[] num) { return num[2] + num[1] + num[0]; } } </code></pre> <blockquote> <p><strong>WITH NUM AS GLOBAL(STATIC)</strong></p> </blockquote> <pre><code>package com; import java.util.Scanner; public class WorkSheet_1 { static int[] num = new int[3]; public static void main(String[] args) { //call for input System.out.println("Please Enter a 3-digit number.."); Scanner in = new Scanner(System.in); for(int i = 0; i &lt; num.length; i++){ int val = in.nextInt(); num[i] = val; } System.out.println("The Sum of the numbers is " + sumNums()); System.out.println("The Reverse of the numbers is " + reverseNums()); } public static int sumNums() { return num[0] + num[1] + num[2]; } public static int reverseNums() { return num[2] + num[1] + num[0]; } } </code></pre>
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