feat: Demonstrate widening and narrowing type conversions in Java

Added a Java class `WideNarrow` to illustrate primitive type casting:
- **Widening conversions** (implicit) from `short` to `int`, `long`, `float`, and `double`
- **Narrowing conversions** (explicit) from `short` to `byte` and `float` to `int`

Highlights:
- Started with `short s = 100`
- Casted `s` to `byte` (explicit narrowing); value preserved since 100 is within byte range
- Implicitly widened `s` to `int`, `long`, `float`, and `double`; all retain original value
- Demonstrated float to int casting with data truncation (e.g., 10.5 → 10)

Included comments and analysis on:
- Behavior when narrowing exceeds type range (e.g., `short s = 130; byte b = (byte)s;` results in overflow and output -126)
- Safe vs. unsafe conversions based on data range

This program serves as a foundational reference for understanding Java's type conversion mechanisms.

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

Author: Someshdiwan

Section5OperatorExpression/src/WideNarrow.java

@@ -120,4 +120,4 @@ Byte wraps around (because of overflow):
 Narrowing (short → byte) works only when the value fits the range.
 
 If the value exceeds the target type's range, overflow occurs.
-*/
+*/