H16-Assign2ADTs - CS106B J Zelenski Handout #16 Jan 23,...

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CS106B Handout #16 J Zelenski Jan 23, 2008 Assignment #2: ADT 1 Client Extravaganza Inspiration credit to Joe Zachary, University of Utah (random writer). Due Wed Jan 30th 2:15pm You've been introduced to the handy CS106 class library, now it's time to put these objects to work! In the role of client with the low-level details abstracted away, you can put your energy toward solving more interesting problems. Your next assignment is to write two short client programs that heavily leverage our classes to do nifty things. The tasks may sound a little daunting at first, but given the power tools in your arsenal, each requires only a page or two of code. Let's hear it for abstraction! The assignment has several purposes: 1. To more fully experience the joy of using pre-written classes. Most of the heavy-lifting is handled by objects from our class library. 2. To stress the notion of abstraction as a mechanism for managing data and providing functionality without revealing the representational details. 3. To become familiar with using C++ class templates. 4. To gain practice with classic data structures such as the stack, queue, vector, map, and set. Part A— Random writing and Markov models of language In the past few decades, computers have revolutionized student life. In addition to providing no end of entertainment and distractions, computers also have also facilitated much productive student work. However, one important area of student labor that has been painfully neglected is the task of filling up space in papers, Ph.D. dissertations, grant proposals, and recommendation letters with important sounding and somewhat sensible random sequences. Come on, you know the overworked TA/professor/reviewer doesn't have time to read too closely… To address this burning need, the random writer is designed to produce somewhat sensible output by generalizing from patterns found in the input text. When you're coming up short on that 10-page paper due tomorrow, feed in the eight pages you already have written into the random writer, and voila! another couple of pages appear. You can even feed your own .cpp files back into your program and have it build a new random program on demand. How does this work? Random writing is based on an idea advanced by Claude Shannon in 1948 and subsequently popularized by A.K. Dewdney in his Scientific American column in 1989. Shannon's famous paper introduces the idea of a Markov model for English text. A Markov model is a statistical model that describes the future state of a system based on the current state and the conditional probabilities of the possible transitions. Markov models have a wide variety of uses, including recognition systems for handwriting and speech, machine learning, bioinformatics, even Google's PageRank algorithm has a Markov component to it. In the case of English text, the Markov model is used to describe the possibility of a particular character appearing given the sequence of characters seen so far. The
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This note was uploaded on 10/12/2011 for the course CS 108 taught by Professor Smith during the Spring '11 term at Central Mich..

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H16-Assign2ADTs - CS106B J Zelenski Handout #16 Jan 23,...

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