Logic Programming Logic Programming March 17, 2021 COM S 342 Principles of Programming Languages @ Iowa State University 1 COM S 342 Principles of Programming Languages @ Iowa State University 2 ?- loves(X, tom). mary ?- loves(mary, Y). tom ?- loves(mary, jane). falseCOM S 342 Principles of Programming Languages @ Iowa State University 3 What […]
CS 342 Principles of Programming Languages Exam 1 Midterm 1. Multiple Choice Questions: select all the correct answers for the following questions. (a) (3 pt) Given the following grammar, select the strings that it accepts. real − number → signpart.part|signpart sign→ +|− part→ digit|digitpart digit→ 0|1|2|3|4|5|6|7|8|9 i. +32.52 ii. 3 iii. -.5 iv. -000. Sol
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TypeLang: a language with types TypeLang: a language with types April 7, 2021 COM S 342 Principles of Programming Languages @ Iowa State University 1 Overview I Concepts I Types I Type system I Type inference and type checking I Typelang (ML: LISP with types) I Type rules (type checking rules) COM S 342 Principles
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Lecture 4. Varlang – variables Lecture 4. Varlang – variables February 1, 2021 Overview I What is a variable? I Varlang syntax I Language design decisions related to variables: scoping I Semantics of Varlang: how to evaluate a program with variables What does variable mean in programming languages? Abstraction: encapsulate the details I Reuse I
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Lecture 4. DefineLang – Global Variables Lecture 4. DefineLang – Global Variables February 1, 2021 Local and Global Variables I Local variable: available based on the scope of the let expression I Global variable: available during the entire iteration with the interpreter I (define Sun 0) I (define a 97) I DefineLang: new feature added
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CS 342 Principles of Programming Languages Homework 5 Homework Solutions: FuncLang (Part II) Learning Objectives: 1. Functional programming 2. Understand and expand FuncLang interpreter Instructions: • Total points: 54 pt • Early deadline: Mar 24 (Wed) at 11:59 PM; Regular deadline: Mar 26 (Fri) at 11:59 PM (you can continue working on the homework till
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CS 342 Principles of Programming Languages Homework 8 Homework Solutions: TypeLang Learning Objectives: 1. Understanding and implementing typing rules Instructions: • Total points 66 pt • Early deadline: Apr 14 (Wed) at 11:59 PM; Regular deadline: Apr 16 (Fri) at 11:59 PM (or till TAs start grading the homework) • Download hw8code.zip from Canvas. Interpreter
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CS 342 Principles of Programming Languages Homework 8 Homework: TypeLang Learning Objectives: 1. Understanding, writing, and implementing typing rules 2. TypeLang programming Instructions: • Total points 66 pt • Early deadline: Apr 14 (Wed) at 11:59 PM; Regular deadline: Apr 16 (Fri) at 11:59 PM (or till TAs start grading the homework) • Download hw8code.zip
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CS 342 Principles of Programming Languages Homework 7 Homework Solutions: RefLang Learning Objectives: 1. RefLang programming 2. Understand and expand RefLang interpreter Instructions: • Total points: 48 pt • Early deadline: April 7 (Wed) at 11:59 PM; Regular deadline: April 9 (Fri) at 11:59 PM (you can continue working on the homework till TA starts
RefLang: a language about references/pointers RefLang: a language about references/pointers March 11, 2021 Side Effect I Pure functional programs have no side effects: given the same input a functional program would produce the same output. I Side effect: change the state of the program besides its output, i.e.,it can potentially effect other functions and programs.
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