feat: Add AddingNumber class to sum command-line arguments

WHAT the code does:
- Defines an `AddingNumber` class with a `main()` method.
- Initializes sum variable `s = 0`.
- Iterates over command-line arguments (`args`).
- Parses each argument as a `double` and adds it to the sum.
- Prints the total sum.

WHY this matters:
- Demonstrates handling **command-line arguments** in Java.
- Shows how to **parse strings into numeric values** (`Double.parseDouble`).
- Reinforces iteration using enhanced `for` loops.

HOW it works:
1. Run program with numbers as arguments:

java AddingNumber 10 20 30.5

2. Each string argument is parsed to a double.
3. Sum accumulates (`10 + 20 + 30.5 = 60.5`).
4. Output: `"Sum is 60.5"`.

Tips & gotchas:
- If a non-numeric argument is passed, `NumberFormatException` will be thrown.
- Commented regex (`x.matches("[0-9\\.]+")`) could be re-enabled to filter invalid inputs.
- Floating-point precision issues may occur for large sums — use `BigDecimal` if needed.
- For integer-only inputs, `Integer.parseInt` would be more appropriate.

Use-cases:
- Educational demo for **command-line argument parsing**.
- Simple utility to sum numbers provided at runtime.
- Can be extended to handle subtraction, multiplication, or average.
- Useful practice for error handling and input validation.

Short key: class-adding number-cli-sum.

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

Author: Someshdiwan

Section10Methods/src/AddingNumber.java

@@ -2,8 +2,7 @@ public class AddingNumber {
     public static void main(String[] args) {
         double s = 0;
 
-        for(String x: args)
-        {
+        for(String x: args) {
             //if (x.matches("[0-9\\.]+"))
             s=s+Double.parseDouble(x);
         }