University of Sussex Informatics Spring 2021 Limits of Computation Exercises 2 (covers Lectures 3–5) WHILE-programs: Syntax & Semantics and Extended WHILE 1. Consider the binary tree t, given in linear notation: ⟨ ⟨ ⟨ nil.nil ⟩.nil ⟩.⟨ ⟨ nil.nil ⟩.nil ⟩ ⟩ (a) Draw t in the usual two-dimensional form. (b) Does t encode a […]
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University of Sussex Informatics Spring 2021 Limits of Computation Exercises 3 Programs-As-Data, Self-Interpreter, and hwhile 1. Consider the programs p1 in Figure 1 and add in Figure 2. p1 read L { R := 0; X := hd L; Y := hd tl L; while X { R := [ Y, R ]; X :=
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Limits of Computation 7 – A universal program (Self-interpreter) Bernhard Reus 1 So far… • … we have learned the WHILE-language… • …that we have chosen to represent our notion of computation (to write “effective procedures”). • We learned how to represent programs-as- data… • …so now we can write interpreters. 2 • Eating your
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The National Student Survey (NSS) 2021 Have your say 1 Have your say What is the NSS? A national survey of all final-year undergraduate students. It’s designed to find out about your experience of studying at Sussex When does the survey run? The NSS opened on 6 January and closes on 30 April 2021 Why
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University of Sussex Informatics Spring 2021 Limits of Computation Feedback to Exercises 2 (covers Lectures 3–5) Dr Bernhard Reus WHILE-programs: Syntax & Semantics and Extended WHILE 1. Consider the binary tree t in linear notation: ⟨ ⟨ ⟨ nil.nil ⟩.nil ⟩.⟨ ⟨ nil.nil ⟩.nil ⟩ ⟩ (a) Draw t in the usual two-dimensional form. Answer
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Limits of Computation 8 – Our first non-computable problem Bernhard Reus 1 A non-computable problem THIS TIME • • we consider a decision problem: the Halting Problem, and prove it is WHILE- undecidable! Deep Thought we define formally what computability and decidability means (for WHILE) “What is the Ultimate Answer to Life, the Universe, and
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Limits of Computation 9 – More non-computable problems Bernhard Reus 1 Last time • we have seen that the Halting Problem for WHILE-programs cannot be decided by a WHILE-program, but … • … can we say something at least? 2 • More undecidable problems we show that Halting Problem is semi-decidable (and explain what that
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Assignment 1: File Explorer Introduction For the rest of the assignments in this course, we will be building a distributed social communication platform. The program will allow you to send and receive messages with other students in the class. We will start with a command line interface and end with a graphical interface. At the
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CS367 Project 2 – Floating Point System Spring 2021 CS 367 Project #2 – Spring 2021: Floating Point Representation Due: Friday, March 5th 11:59pm This is to be an individual effort. No partners. No late work allowed after 48 hours; each day late automatically uses one token. 1. Project Overview: In class, we talked about
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Candidate Number THE UNIVERSITY OF SUSSEX BSc and MComp FINAL YEAR EXAMINATION May/June 2018 (A2) Limits of Computation Assessment Period: May/June 2018 (A2) DO NOT TURN OVER UNTIL INSTRUCTED TO BY THE LEAD INVIGILATOR Candidates should answer TWO questions out of THREE. If all three questions are attempted only the first two answers will be
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