CSCI 1320 (Principles of Computer Science I):
Sample Programs

Disclaimer: Code linked from this page is intended as a cleaned-up and commented version of examples from class. Many programs could be further improved with regard to functionality or design, but then they would no longer be as close to what we did in class.

Programs

• "Hello, world" program (8/29) hello.scala.
• Several versions of program to count out change (9/12) change.scala, change2.scala (incomplete), change3.scala.
• Another version of program to count out change (9/17) change4.scala.
• Prototype program to compute grade (9/17) grades.scala.
• Prototype program to compute grade, slightly improved version with function (9/19) grades.scala.
• Preliminary/incomplete version of function to solve quadratic equation (9/19) roots.scala.
• Factorial functions (10/01) factorial.scala.
• Program to "count down" using recursion (10/01): countdown.scala.
• Program to sum numbers using recursion (10/01): sum.scala.
• Fibonacci function (10/03) fibonacci.scala.
• Program to maintain running balance for checkbook (10/03) checkbook.scala.
• Demo program for arrays (10/15, 10/17) array-demo.scala.
• Demo program for lists (10/15, 10/17) list-demo.scala.
• Function to check whether a string is a palindrome (10/22) palindrome.scala.
• Function to compute variance of list (10/22) variance.scala.
• Program to sum integers using loop (10/29) sum-loop.scala.
• Demo programs for arrays, lists using loops (10/31) array-demo-loop.scala, list-demo-loop.scala.
• Program to maintain running balance and transaction history for checkbook, preliminary version (10/31): checkbook-transactions.scala.
• Program to sum integers read from file (11/05) sum-from-file.scala.
• Program to echo command-line arguments (11/07) echo-args.scala.
• Program to maintain running balance and transaction history for checkbook, version using file (11/07): checkbook-transactions-file.scala.
• Program to maintain running balance and transaction history for checkbook, version using case classes (11/14): checkbook-transactions-case-class.scala.
• Program to sum integers read from file, version that catches common errors (11/14): sum-from-file-catch-errors.scala.
• Function to sort array of numbers using bubble sort (11/26): bubble-sort.scala.
• Example GUI programs (11/28):
  "Hello world" gui-hello.scala.
  Simple editor simple-editor.scala.
  Calculator prototype calculator-prototype.scala.
  Drawing-program prototype drawing-prototype.scala.
  Simple animation example simple-animation.scala.

Other files

• Script to mail files for homework submission mail-files. To use this secript, do the following setup:
  • Put a copy in your directory (probably simpler to use your browser's "save" rather than trying to cut and paste).
  • Use the command chmod u+x mail-files to tell the system that this is an executable script.
  You can now use it to mail me one or more files containing source code, for example:

  	mail-files pgm1.scala pgm2.scala ....
  	

  It prompts for homework number and text to include as the body of the message, and sends a Cc of the message to your username at trinity.edu. (If you don't get the Cc message, something probably went wrong. It may appear to come from a username that looks like a date, e.g., 2012-08-22. This is a result of our scheme for keeping track of when user accounts were created.)