feat: Add MethodsCC2 class with squareAndCube for doubles

WHAT the code does:
- Defines a `MethodsCC2` class with a static method `squareAndCube(double x)`.
- Method computes and prints both the square and cube of a double value.
- `main()` demonstrates the method with values `2.999`, `3.333`, and `4`.

WHY this matters:
- Shows how methods can handle **floating-point numbers** using `double`.
- Demonstrates precision differences between integer and double arithmetic.
- Reinforces code reuse with a single method applied to multiple inputs.

HOW it works:
1. `squareAndCube(2.999)` → prints approx `8.994001` and `26.963999999999995`.
2. `squareAndCube(3.333)` → prints approx `11.108889` and `37.011926036999995`.
3. `squareAndCube(4.0)` → prints `16.0` and `64.0`.

Tips & gotchas:
- Floating-point results may include rounding errors due to binary representation.
- For cleaner output, consider formatted printing (`System.out.printf("%.3f%n", value)`).
- For very high precision, use `BigDecimal` instead of `double`.
- Can be paired with an `int` overload to demonstrate **method overloading**.

Use-cases:
- Educational example for **methods with double parameters**.
- Useful in scientific or financial calculations.
- Demonstrates method reuse for different inputs.
- Good practice exercise for handling precision in Java.

Short key: class-methodscc2-squareandcube-double.

Signed-off-by: https://github.com/Someshdiwan <[email protected]>

Author: Someshdiwan

Section10Methods/PracticeProblems/src/MethodsCC2.java

@@ -1,13 +1,9 @@
-public class MethodsCC2
-{
-    public static void squareAndCube(double x)
-    {
+public class MethodsCC2 {
+    public static void squareAndCube(double x) {
         System.out.println(x * x);
         System.out.println(x * x * x);
     }
-
-    public static void main(String[] args)
-    {
+    public static void main(String[] args) {
         double a = 2.999;
         double b = 3.333;
         double c = 4;
@@ -16,4 +12,4 @@ public static void main(String[] args)
         squareAndCube(b);
         squareAndCube(c);
     }
-}
+}