EZ Interpreter

This simple command interpreter was a project for my Data Structures course. It was intended to demonstrate our knowledge of stacks, recursion, and infix/postfix algorithms. It also demonstrates my coding and commenting style. Because it's a class project, comments are more verbose than they might otherwise be--know your audience--though I do tend to comment quite a bit.

Introduction

Given an input text file with a set of commands, this program will run the commands and produce the output--like a barebones assembler. See the PDF for the original assignment.

Commands

The following are valid EZ commands.

• proc <procedure name>: This is how procedures are defined. One procedure must be called main; this is the procedure that will run the program. Note that though procedure calls can be nested, procedure definitions cannot. Each proc ends the previous procedure and starts a new one.
• call <procedure name>: This command calls defined procedures. Call commands can be nested. The first procedure to be called will always be main.
• copy <variable> <expression>: EZ variables correspond to capital letters A-Z, for a total of 26 variables. Expressions are limited to a single integer value, integer addition, or integer multiplication. Variables can also be used in expressions. Examples: copy A 2, copy B 3, copy C A+B, copy D B*C.
• echo <string>: Echo a string, with capital letters replaced with variables. So, to display the value of A, you'd have to use echo a is A. I haven't yet implemented escape characters to allow for capital letters.

TO DO

• Implement additional mathematical functions in copy.
• Implement escape characters in echo command.