RPN Command-Line Calculator

Project roadmap

1. 01

   Design the stack data structure

   ~1h

   Implement a fixed-size array-based stack with push, pop, and peek functions for double values.

2. 02

   Tokenize input expressions

   ~1h

   Use strtok to split an input line into whitespace-separated tokens (numbers and operators).

3. 03

   Implement the RPN evaluation loop

   ~2h

   For each token, push numbers onto the stack or pop two operands and apply an operator, pushing the result back.

4. 04

   Add error handling

   ~1.5h

   Detect and report stack underflow, division by zero, and invalid tokens with clear error messages.

5. 05

   Support interactive and file input modes

   ~1h

   Let the program read expressions from stdin interactively or from a file passed as an argument.

Resources

• DocsC Language Reference