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Programming Challenges and Solutions in CompSci 100e: Spring 2011 Overview

In this announcement for CompSci 100e, we discuss key programming assignments and debugging strategies. Assignment Prestidigitation is due on February 8, and students are encouraged to utilize Java for project creation. Debugging techniques include adding print statements, tracing cases by hand, and simplifying inputs to identify issues. Additionally, we'll explore set operations and the implementation of maps using TreeMap and HashMap to organize data effectively. Key concepts such as keys and values will be emphasized with practical coding examples.

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Programming Challenges and Solutions in CompSci 100e: Spring 2011 Overview

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  1. CompSci 100eProgram Design and Analysis II February 3, 2011 Prof. Rodger CompSci 100e, Spring2011

  2. Announcements • APT 0210 due next Thursday! • Assignment Prestidigitation due 2/8 CompSci 100e, Spring2011

  3. Debugging • What can you do when your APT/program doesn’t work? • Consulting hours • Get Sleep – rest those eyes • Debug • Add print statements • APTs – output right away “Starting new problem” • Add in focused output (inside a loop (if k=mulitple of 10, print) • Make it simpler – add a main and test with smallest case it doesn’t work for • Trace simple case by hand • Test each method with input and output CompSci 100e, Spring2011

  4. Assignment Prestidigitation – now due Tuesday, Feb 8 • Getting Started – no snarf • Create Java Project • Create Class file • Use previous code – cut and paste • Read in input from file • Copy data files CompSci 100e, Spring2011

  5. Sets - Operations • What operations can you do on a set? • Classwork 3 CompSci 100e, Spring2011

  6. Maps • Maps are another way of organizing data • Keys and Values • Each key maps to a value • Some keys can map to the same value • Can change the value a key maps to

  7. Example • Each student could be mapped to their favorite ice cream flavor

  8. Implementing a Map • We will use TreeMap in Java • Will also use HashMap, another implementation • Example: TreeMap<String, String> fav = new TreeMap<String,String>(); • Keys map to values

  9. To use a Map • Put in a key and its value fav.put(“Forbes”, “Strawberry”); • Get a value for a key val = fav.get(“Forbes”); • Change value for key fav.put(“Astrachan”, “Coffee Mocha”); • Get all the keys as a set Treeset<String> ky = fav.keyset();

  10. Change Astrachan’s value

  11. Value could be a set

  12. Let’s go back to ClassScores • Find all the modes in an array of ints • This time solve it using a map CompSci 100e, Spring2011

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