Programming Assignment 3: A Simple Calculator


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CSC 471/371 Mobile Application Development for iOS
Programming Assignment 3: A Simple Calculator

• Submit your assignment in D2L Dropbox.
• Submit a single zip file that contains the contents of the project folder
o To zip your project folder: Ctrl-click your project folder and select
“Compress …” from the context menu.
• It is mandatory to use Xcode 10 and Swift 4 for this assignment.
• Include only your source code files, including
o *.swift, *.plist, *.xib, *.storyboard
o image files
o project files (.xcodeproj)
o test folders
• You must use a unique prefix for the project name. (I suggest you use your last name
and first initial as your prefix.) Please use the same prefix for all your
o Note you only need to use the prefix for the project name. It is not necessary
to use the prefix on other files in your project.
• Do not include unused or unrelated files.
• Before you submit, build and run the project, make sure everything compiles and
works. Close your project before zipping the folder.
• Here are the most common reasons assignments are marked down:
o Project does not build.
o Project does not build without warnings.
o One or more items in the Requirements section were not satisfied.
o A fundamental concept was not understood.
o Code is sloppy and hard to read (e.g. indentation is not consistent, etc.).
o Your solution is difficult (or impossible) for someone reading the code to
understand due to lack of comments, poor variable/method names, poor
solution structure, etc.
• Bonus points.
o Bonus points may be awarded to projects with exceptional qualities in one or
more aspects.
o Bonus points will only be awarded after all the required elements have been
o Bonus points will not be awarded merely for extra amount of work (or code).
o Extra and sloppy code may cause your assignments to be marked down.
o Bonus points are awarded at the sole discretion of the instructor.
• Explore Xcode and Swift language
• Explore Swift andiOS API documentation
o String class
o UIButton and UILabel classes
• Connect outlets and actions in Xcode
1. Create a simple calculator app similar to the one shown below
o Use UIButton for the digits, ‘+’, and ‘=’ keys.
o Use a UILabel to display the result.
o You only need to handle integer additions in this assignment.
o The current number should be displayed after each digit key is pressed.
o After the ‘+’ key is pressed, the app waits for the next number to be added.
o The result, i.e., the sum, should be displayed after the ‘=’ key is pressed.
o Your app should properly handle key stroke sequences such as follows:
o 1 2 + 4 5 =
o 1 2 + 4 5 = + 6 7 =
2. Make sure your program
a. builds without errors or warnings, and
b. runs without crashing
The following are some of the methods and properties that might be useful in this
• Use Int(str) to convert a string to an integer. (Note that the result type is an
optional type.)
Look them up in the API documentation for how to use these and other methods and
• UILable class reference
o text property
• UIButton class reference
o currentTitle property

PlaceholderProgramming Assignment 3: A Simple Calculator
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