feat: Demonstrate for, while, and do-while loops with user input and output

🧠 Logic & Purpose:
- Added examples for printing numbers and messages using:
  - `for` loop (e.g., 1 to 5 with custom step)
  - `while` loop to print numbers from 1 to 5
  - `do-while` loop to ensure the body runs at least once
- Included user input using `Scanner` to repeat "Hello World" n times
- Preserved original comments and code for learning reference
- Structured the output and comments to make loop behavior easily understandable

📁 Files:
- `Loop.java`: Includes commented learning examples, restored basic while/do-while logic
- `Loop2.java`: Active implementation with user input, step-wise for-loop, and all loop variants.

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

Author: Someshdiwan

Section7ConditionalStatements/Practice/src/Loop.java

@@ -0,0 +1,58 @@
+import java.util.Scanner;
+
+public class Loop {
+    public static void main(String[] args) {
+
+        /*
+            Syntax of for loop:
+            for (initialisation; condition; increment/decrement) {
+                // loop body
+            }
+        */
+
+        // Q: Print numbers from 1 to 5 with step size of 2
+//        for (int num = 1; num <= 5; num += 2) {
+//            System.out.println(num); // prints: 1, 3, 5
+//        }
+
+        // Print "Hello World" n times using for loop
+        Scanner in = new Scanner(System.in);
+//        int n = in.nextInt(); // Input n from user
+
+//        for (int num = 1; num <= n; num++) {
+////            System.out.print(num + " "); // Uncomment to print numbers from 1 to n
+//            System.out.println("Hello World"); // Prints "Hello World" n times
+//        }
+
+        // Syntax of while loop:
+        /*
+            while (condition) {
+                // loop body
+            }
+         */
+
+        // Example of while loop printing numbers from 1 to 5
+//        for (int num = 1; num <= 5; num += 2) {
+//            System.out.println(num); // Prints: 1, 3, 5
+//        }
+
+        int num  = 1;
+        while (num <= 5) {
+            System.out.println(num); // Uncommented to actually print numbers from 1 to 5
+            num += 1;
+        }
+
+        // Syntax of do-while loop:
+        /*
+            do {
+                // loop body
+            } while (condition);
+         */
+
+        int n = 1;
+        do {
+            System.out.println("Hello World"); // This will execute at least once even if condition is false
+        } while (n != 1); // Since n == 1, this runs only once
+
+    }
+}

Section7ConditionalStatements/Practice/src/Loop2.java

@@ -0,0 +1,57 @@
+import java.util.Scanner;
+
+public class Loop2 {
+    public static void main(String[] args) {
+
+        /*
+            Syntax of for loops:
+
+            for (initialisation; condition; increment/decrement) {
+                // body
+            }
+        */
+
+        // Q: Print numbers from 1 to 5
+        for (int num = 1; num <= 5; num += 2) {
+            System.out.println(num); // prints 1, 3, 5 (incremented by 2)
+        }
+
+        // print numbers from 1 to n
+        Scanner in = new Scanner(System.in);
+        int n = in.nextInt(); // take input from user
+
+        for (int num = 1; num <= n; num++) {
+//            System.out.print(num + " "); // prints numbers from 1 to n on same line
+            System.out.println("Hello World"); // prints "Hello World" n times
+        }
+
+        // while loops
+        /*
+            Syntax:
+            while (condition) {
+                // body
+            }
+         */
+
+        // Same logic as first for-loop: print numbers from 1 to 5 using while loop
+        int num  = 1;
+        while (num <= 5) {
+            System.out.println(num); // prints 1 2 3 4 5
+            num += 1;
+        }
+
+        // do while
+        /*
+            Syntax:
+            do {
+                // body
+            } while (condition);
+         */
+
+        int m = 1;
+        do {
+            System.out.println("Hello World"); // This will run at least once
+        } while (m != 1); // Since condition is false, loop runs only once
+
+    }
+}