G6021: Comparative Programming Exercise Sheet 9 A: Logic Programming We will implement a small fragment of a logic programming language. First we explain the language. Programs are collections of: • facts: things that are known to be true, • and rules: ways to generate new facts. In addition, we have a query which is a […]
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G6021 Comparative Programming Part 6 – Summary Part 6 – Summary G6021 Comparative Programming 1/15 Overview Programming paradigms: Functional Object oriented Logic programming Imperative Emphasis on functional programming in Haskell for the labs, however, the exam will be more balanced. Part 6 – Summary G6021 Comparative Programming 2/15 Main Topics Types: subtypes, polymorphism, overloading Semantics:
G6021 Comparative Programming Part 4 – Types Part 4 – Types G6021 Comparative Programming 1/63 Typed λ-calculus There are many variants of the λ-calculus (applied λ-calculi). Here we briefly outline the simply typed λ-calculus; and a minimal functional programming language. Definition: Types: type variables: σ, τ,… and function types: σ → τ Typed terms: terms
G6021 Comparative Programming Prolog questions Prolog questions G6021 Comparative Programming 1/5 Example: Last Write Prolog clauses to find the last element of a list. Give a trace of your clauses for the query last([a,b,c],L), showing the substitutions at each step Advice for most people following this module: always think of a Haskell solution first: last
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Some worked examples for G6021 Comparative Programming 1 Fixed points of functionals Any recursive function can be written as a fixed point (or fixpoint) of a functional. In the course we use the language PCF for this (which is the ¦Ë-calculus with a few extras). A typical question will ask you to a write function
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G6021: Comparative Programming Exercise sheet 8 1 Imperative Language The goal of this exercise is to write, in Haskell, an interpreter for a simple imperative programming language. This language has variables, assignments, conditionals and while loops. The salient feature of imperative languages is that they use a memory that is updated by the program. We
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G6021 Comparative Programming Part 5 – Logic Programming (Prolog) Part 5 – Logic Programming (Prolog) G6021 Comparative Programming 1/22 Logic Programming Languages Use logic to express knowledge, describe a problem. Use inference to compute, manipulate knowledge, obtain a solution to a problem. Based on this idea, several programming languages have been developed. The most popular
1 1. 2. 3. G6021: Comparative Programming Exercise Sheet 3 Functions on lists Write a function addOneToAll that will add one to all the elements of a list. Write this two ways, first using pattern matching, then using list comprehensions. Answer: addOneToAll [] = [] addOneToAll (h:t) = (h+1):addOneToAll t addOneToAllLC l = [x+1 |
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1. (a) G6021: Comparative Programming Exam Practice 4 Write a function first in Haskell that takes as parameters a number n and a list of numbers l, and returns the first n elements of the list l. The following shows the expected behaviour: first 3 [9,2,4,7,6,5] = [9,2,4] first 0 [1,2,3,4,5,6,7] = [] first 10
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COMP90057 Advanced Theoretical Computer Science Lecture slides: Computability (weeks 8-12) Liz Sonenberg & Tony Wirth Drawing on material prepared by Harald Søndergaard and Elena Kelareva Second Semester, 2020 © The University of Melbourne Adv. TCS © The Univ. of Melb. (2020) Lecture slides: Computability (weeks 8-12) 1 / 198 Table of Contents 1 Welcome and