🎯 Purpose • To create a clean and organized folder structure • To understand the relationship between Controller and View • To place UI components properly and neatly • To perform basic logic operations in the Controller

🧱 Architecture • Uses a simple MVC structure

🛠️ Technologies • Swift + UIKit • All UI is created in a single storyboard • No extra .xib or .view files were added • All buttons are connected to the controller using outlet and action

📐 UI and Responsive Design • Number and operator buttons are placed using vertical and horizontal stack views • Stack Views are resized dynamically using Auto Layout • Only one Storyboard is used to build the interface

🔄 Functionality • User inputs are handled in the controller • A single function is used for all operations using a switch-case structure • Results are shown on the screen using a UILabel • Each operation does not have a separate function

🔑 Keywords MVC · Storyboard · Auto Layout · Stack View · Swift · UIKit