A simple calculator app using swift and storyboard. This an extension of the project taught in the udemy course https://www.udemy.com/course/ios-13-app-development-bootcamp/ . In the course they teach the way to layout an app based on screen sizes. I added logic to the same and made it work like a calculator.
This project uses NSexpression to calculate the result and display it on the screen. It also uses storyboard as the choice of interface builder.