Infix to Postfix Expression Converter
Convert infix math expressions to postfix using the Shunting Yard algorithm. Classic stack interview problem. Whether you're solving coding interview problems or studying for exams, understanding how to convert infix notation to postfix (rpn) notation is essential.
How It Works
Conversion Logic:
Use a stack for operators. Output operands immediately. Push operators based on precedence. Pop higher/equal precedence operators before pushing.
This is a fundamental skill tested in coding interviews, competitive programming, and CS theory exams.
Step-by-Step Examples
Example 1
Input: A + B * C
Output: A B C * +
Explanation: * has higher precedence, so B C * is evaluated first
Example 2
Input: (A + B) * C
Output: A B + C *
Explanation: Parentheses force A + B first
Example 3
Input: A + B - C * D
Output: A B + C D * -
Explanation: * binds tighter; left-to-right for same precedence
Practice Problems
Test your understanding with these exercises:
Interview tip: Be ready to explain the conversion process step-by-step on a whiteboard.
Implementation Code
python# Infix to Postfix Expression Converter implementation def convert(input_value): # Apply: Use a stack for operators. Output operands immediately. Push operators based on precedence. Pop higher/equal precedence operators before pushing. pass # Implement the conversion logic
Frequently Asked Questions
How to convert Infix notation to Postfix (RPN) notation?
Is this conversion asked in interviews?
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