The author expresses a deep fascination with calculators and explores the intricacies of building a simple button-operated calculator from scratch. They highlight the challenges and unique features of calculator design, such as handling input errors and special cases. The author discusses the complexity of implementing basic arithmetic operations and the historical context behind certain calculator functionalities, such as the K-constant feature. They also point out the quirky behaviors of old calculators, showcasing the evolution of calculator interfaces over the years. The article provides an insightful look into the world of calculator design and functionality.
https://lcamtuf.substack.com/p/ui-is-hell-four-function-calculators