Change project structure to a Maven Java project + Refactor (#2816)

src/main/java/com/thealgorithms/maths/ReverseNumber.java

@@ -0,0 +1,30 @@
+package com.thealgorithms.maths;
+
+import java.util.Scanner;
+import java.util.NoSuchElementException;
+import java.lang.IllegalStateException;
+
+public class ReverseNumber {
+
+    public static void main(String[] args) {
+        int number;
+        int reverse = 0;
+
+        try (Scanner sc = new Scanner(System.in)) {
+            System.out.println("Enter a number:");
+            number = sc.nextInt();
+        } catch (NoSuchElementException | IllegalStateException e) {
+            System.out.println("ERROR: Invalid input");
+            return;
+        }
+
+        while (number != 0) {
+            int remainder = number % 10;
+
+            reverse = reverse * 10 + remainder;
+            number = number / 10;
+        }
+
+        System.out.println("The reverse of the given number is: " + reverse);
+    }
+}