Java Expression Converter & Evaluator (Infix to Postfix + Evaluation)

This project implements a mathematical expression converter and evaluator in Java. It converts an infix expression (e.g. 3 + 4 * 2 / (1 - 5)^2) into postfix notation (Reverse Polish Notation), and then evaluates the postfix result. 🔍 Key Features Infix → Postfix conversion using stack-based logic. Postfix expression evaluation supporting: Addition (+) Subtraction (-) Multiplication (*) Division (/) Power (^) Handles parentheses and operator precedence correctly. Detects invalid expressions and division by zero. Uses a custom linked-list stack implementation (StackLinkedList). Built in pure Java, no external libraries required. 🧠 Technical Highlights Written in Java SE. Demonstrates data structure usage (stacks, linked lists). Includes error handling (invalid operator, empty stack, divide by zero). Easy to integrate into larger calculator or compiler projects. 💡 Possible Uses Educational demonstration of stack algorithms. Backend for calculator applications. Expression parser or compiler component.