feat: Reverse copy an array by iterating from end of source to beginning

🧠 Logic:
- Given array `A` is copied into array `B` in reverse order.
- Loop runs from end of `A` (`A.length-1`) to start, while inserting into `B` from index 0 onward.
- Demonstrates how to reverse an array during the copy process.
- Final result is printed using an enhanced for-loop.

Signed-off-by: Somesh diwan <[email protected]>

Author: Someshdiwan

Section9ArrayAB/Array IMP/ReverseCopyingArray.java

@@ -1,16 +1,41 @@
 public class ReverseCopyingArray {
-    public static void main(String[] args)
-    {
+    public static void main(String[] args) {
         int A[]={8,6,10,9,2,15,7,13,14,11};
         int B[]=new int[10];
 
-        for(int i=A.length-1,j=0;i>=0;i--,j++)
-        {
+        for(int i=A.length-1,j=0;i>=0;i--,j++) {
             B[j]=A[i];
         }
-        for(int x:B)
-        {
+        for(int x:B) {
             System.out.print(x+",");
         }
     }
 }
+
+/*
+1. Initialization part: `int i=A.length-1,j=0`
+    - Creates two counters in one statement
+    - starts from the last index of array A (A.length-1) `i`
+    - starts from 0 `j`
+
+2. **Condition part** : `i>=0`
+    - Loop continues as long as is greater than or equal to 0 `i`
+    - Only checks, since will naturally stay within bounds `i``j`
+
+3. Increment/Decrement part: `i--,j++`
+    - decrements by 1 in each iteration (moves backwards) `i`
+    - increments by 1 in each iteration (moves forwards) `j`
+
+4. Loop body: `B[j]=A[i]`
+    - Copies element from position of array A to position of array B `i``j`
+
+Here's how it works step by step:
+
+Iteration 1: i=9, j=0  → B[0] = A[9]
+Iteration 2: i=8, j=1  → B[1] = A[8]
+Iteration 3: i=7, j=2  → B[2] = A[7]
+...and so on
+
+This is a compact way of writing two counters moving in opposite directions.
+It could also be written as two separate loops or with just one counter, but this is more efficient as it does the job in a single pass.
+*/