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 (8/28) hello.scala.
• Two versions of program to count out change (9/11) countchange-val.scala, countchange-var.scala.
• Two more versions of program to count out change (9/16) countchange-val-2.scala, countchange-var-2.scala.
• Sketch of program to calculate letter grade (9/16) grades.scala.
• Revision of letter-grade program using function (9/23) grades-2.scala.
• Bounding-box function (9/23) bbox.scala.
• Factorial functions (9/25) factorial.scala.
• Program to "count down" using recursion (not in class) countdown.scala.
• Program to sum numbers using recursion (10/07) sum.scala.
• Fibonacci function (not in class) fibonacci.scala.
• Four-function calculator program (10/07) calc.scala.
• Array demo program, recursive version (10/09) array-demo.scala.
• List demo program, recursive version (10/09) list-demo.scala.
• Array demo program, collection-methods version (not in class) array-demo-2.scala.
• List demo program, collection-methods version (not in class) list-demo-2.scala.
• Function to check whether string is a palindrome (10/20) palindrome.scala.
• Function to compute variance (10/20) variance.scala.
• Array demo program, loop version (10/30, partly) array-demo-3.scala.
• List demo program, loop version (not in class) list-demo-3.scala.
• Program to sum integers using loop (10/30) sum-loop.scala.
• Program to find primes (10/30) primes.scala.
• Simple "ASCII art" program to test/display bounding box function, preliminary version (11/04) ascii-art-1.scala.
• Simple "ASCII art" program to test/display bounding box function, revised version (not in class?) ascii-art-2.scala.
• Program to sum integers read from file (11/06) sum-from-file.scala.
• Program to echo command-line arguments (11/11) echo-args.scala.
• Program to count lines in files given as command-line arguments (11/11) count-lines.scala.
• Program to combine files (not in class) combine-files.scala.
• Bounding-box function, revised to use case class (11/11) bbox-case-class.scala.
• Program to sum integers read from file, version that deals more nicely with common errors (11/13): sum-from-file-2.scala.
• Revision of letter-grade program to get input from file (11/13): grades-3.scala.
• Sorting and searching (11/20, Dr. Lewis): sorts.scala.
• GUI "hello world" programs (11/25): gui-hello.scala, gui-hello-with-button.scala.
• Simple GUI "sampler" program, multiple versions with slightly different layouts (12/02): gui-sampler.scala, gui-sampler-2.scala, gui-sampler-3.scala.
• Simple graphics "sampler" program (12/04): graphics-sampler.scala.
• Example GUI programs (11/25, 12/02, 12/04):
  • 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 script, 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.)