section.lead { padding-bottom: 100px; } section { padding-bottom: 225px; } section.lead > h1 > strong { color: #375899; font-size: 64px; } section.lead > p:nth-child(3) { font-size: 16px; } h1 { color: #001847; padding-bottom: 0; margin-bottom: 0; } small { font-size: 16px; padding-left: 16px; }

YREA SLS¶

Kyler Olsen

Fall 2025
Snow College
SE 3250
sls.purplecello.org

RPL¶

HP Reverse Polish Lisp

• Based on LISP and Forth
• Stack-oriented language with post-fix notation
• Created by HP for their calculators

Project¶

YREA SLS

• Stack-oriented language with post-fix notation
• C inspired Syntax
• Can run on an embedded system

Language¶

The C Language

• Systems Programming
• Used for Python and PHP interpreters

Excellent fit for my project!

Language¶

The C Language

• Manual memory management is difficult to get right.
• C development in a Linux environment was fun and rewarding.
• In the end I had a running program on a RP2040.

Port 1¶

Rust

• Systems Programming (Again)
• Included build system
• Memory safe with the barrow checker

Port 1¶

Rust

• Unlike previous projects in Rust, I didn't fight the barrow checker this time.
• I added exporting and importing the interpreter state in the REPL.

Port 2¶

Python

• My favorite programming language (maybe C is a close second now)
• This port was very easy for me to do.
• I did add a calculator app as an alternative to the REPL or file execution.

The End¶

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