feat: Demonstrate handling of ArithmeticException with try–catch block

WHAT the code does:
- Defines ExceptionDemo with main():
  - Declares integers a = 10, b = 0.
  - Attempts c = a / b inside a try block.
  - Division by zero triggers ArithmeticException.
  - Catch block handles exception, printing user-friendly message plus exception details.
  - Program continues execution and prints "Bye".

WHY this matters:
- Shows how **try–catch** prevents abrupt program termination.
- Without try–catch:
  - Division by zero causes runtime crash.
  - Program terminates, and subsequent lines never execute.
- With try–catch:
  - Exception is caught.
  - Custom message is displayed.
  - Program resumes normally after the catch block.

HOW it works:
1. Execution enters try block.
2. a / b attempts 10 / 0 → triggers ArithmeticException.
3. JVM looks for matching catch block → finds ArithmeticException catch.
4. Prints "Denominator should not be Zero(0) try again: java.lang.ArithmeticException: / by zero".
5. Control resumes after catch → prints "Bye".

Tips and gotchas:
- Always catch the most specific exception possible (ArithmeticException is appropriate here).
- Printing exception e provides both message and exception type.
- Avoid catching generic Exception unless you intend to handle all errors.
- Use Scanner or user input in real scenarios to retry with valid denominator.
- Exception handling should be for exceptional cases, not routine control flow.

Use-cases / analogies:
- Like an airbag: exception handling cushions the crash (division by zero) and allows the program (car) to continue safely.
- In calculators: prevents program from freezing when user divides by zero.

Short key: java exceptions try-catch arithmetic divide-by-zero safe-execution.

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

Author: Someshdiwan

Section18ExceptionHandling/src/ExceptionDemo.java

@@ -10,18 +10,16 @@ public static void main(String[] args) {
             c = a / b;
          /*
          This is without a try catch block.
-
-         Program terminiate and not printing rest of the statements.n
+         Program terminates and does not print the rest of the statements.n
          Exception in thread "main" java.lang.ArithmeticException: / by zero
          at ExceptionDemo.main(ExceptionDemo.java:7)
          */
 
             System.out.println(c);
         }
-        catch (ArithmeticException e)
-        {
+        catch (ArithmeticException e) {
             System.out.println("Denominator should not be Zero(0) try again: "+e);
         }
         System.out.println("Bye");
     }
-}
+}