Update version history for v13.0 and v14.0

Fixed bugs in the interpreter affecting chained subtraction and type casting. Renamed example programs for clarity.

Author: angshumanbasak

JavaCodeVisualizer_VersionHistory.md

@@ -158,7 +158,7 @@ Fixed cursor misalignment after font size increase.
 
 ---
 
-### v12.0 (Final) — Copy/Selection Fix (Native Selection Restored)
+### v12.0 — Copy/Selection Fix (Native Selection Restored)
 **Lines:** ~2,901 | **Date:** May 28, 2026
 
 Fixed word-level copy not working — selecting a single word was highlighting the entire line and copying the full line content.
@@ -175,6 +175,37 @@ Fixed word-level copy not working — selecting a single word was highlighting t
 
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+### v13.0 — Interpreter Bug Fixes (Chained Subtraction + Type Cast)
+**Lines:** ~2,927 | **Date:** May 28, 2026
+
+Fixed two expression evaluator bugs that caused Bubble Sort to produce unsorted output and Array Sum to show wrong average.
+
+- **Bug 1 — Chained subtraction:** `n - i - 1` returned `undefined` because `splitOnOperator(expr, '-')` produced 3 parts but the handler only accepted exactly 2 (`parts.length === 2`). The inner for loop condition `j < n - i - 1` was always `false`, so the swap code never executed. Fix: subtraction handler now processes any number of parts left-to-right using a loop
+- **Bug 2 — Type cast precedence:** `(double) sum / numbers.length` was parsed as `(double) (sum / numbers.length)` — integer division happened first (`21 / 5 = 4`), then the cast (`4.0`). Average showed `4` instead of `4.2`, and the conditional incorrectly printed "Below threshold." Fix: cast handler now detects arithmetic operators after the cast target and applies the cast to only the first operand before performing the operation (`21.0 / 5 = 4.2`)
+- All 8 built-in examples verified working after fixes
+
+---
+
+### v14.0 (Final) — Example Programs Renamed with Descriptive Class Names
+**Lines:** ~2,928 | **Date:** May 28, 2026
+
+Replaced `public class Main` in all 8 built-in example programs with descriptive class names.
+
+- **ArraySumAverage** — Array Sum & Average
+- **BubbleSort** — Bubble Sort
+- **Fibonacci** — Fibonacci (Recursive)
+- **Factorial** — Factorial (Recursive)
+- **BinarySearch** — Binary Search
+- **StringReversal** — String Reversal
+- **FizzBuzz** — FizzBuzz
+- **SelectionSort** — Selection Sort
+- File label now shows `BubbleSort.java`, `Fibonacci.java`, etc. instead of `Main.java`
+- Call Stack tab shows class-contextual names (e.g. `Fibonacci.main(String[] args)`)
+- The `derivedFileName` logic (from v8.0) automatically picks up the new class names
+- All 8 examples tested and verified working with renamed classes
+
+---
+
 ## Summary Table
 
 | Version | Key Change | Lines |
@@ -191,3 +222,5 @@ Fixed word-level copy not working — selecting a single word was highlighting t
 | v10.0 | Fira Code font, 16px size, 28px line height | ~2,921 |
 | v11.0 | Cursor alignment fix (ligatures disabled, font sync) | ~2,931 |
 | v12.0 | Copy/selection fix (native selection restored) | ~2,901 |
+| v13.0 | Interpreter fixes (chained subtraction + type cast) | ~2,927 |
+| v14.0 | Example programs renamed with descriptive class names | ~2,928 |