PPT-1 Formal Semantics of Programming Languages

Program testing can be used to show the presence of bugs but never to show their absence Dijkstra 2 3 4 Semantics of programming languages Basic components to describe programming languages. Lecture 18. Static vs. Dynamic Typing. Dan Grossman. Fall 2011. Static vs. dynamic typing. A big, juicy, essential, topic about how to think about PLs. Conversation usually overrun with half-informed opinions . Software is made by programmers. Computers need all kinds of software, from operating systems to applications. People learn how to tell the computers what to do so that the computers do useful things . Chapter Three. Modern Programming Languages, 2nd ed.. 1. Three “Equivalent” Grammars. Chapter Three. Modern Programming Languages, 2nd ed.. 2. G1. : <. subexp. > ::= . a. | . b. | . c. | <. Chapter One. Modern Programming Languages, 2nd ed. . 1. Outline. What makes programming languages an interesting subject? . The amazing variety. The odd controversies. The intriguing evolution. The connection to programming practice. 1. A Type Is A Set. When you declare that a variable has a certain type, you are saying that the values the variable can have are elements of a certain set. A type is a set of values. plus a low-level representation. Classification of programming languages. “There are only two kinds of programming languages: those people always bitch about and those nobody uses.”. --. Bjarne. . Stroustrup. 1. . Generated using wordle.net from the text of this ppt file. 13. Learning Objectives. Define programming of and describe the six steps of . programming.. Compare . design tools including top-down design, pseudocode, flowcharts, and logic . structures.. Describe program testing and the tools for finding and removing . CS 170b. Benjamin Gaska, much help from William Mitchell. What is a programming language. A simple definition:. A system for describing computation.. It is generally agreed that in order for a language to be . Lecture 14. Thunks. , Laziness, Streams, . Memoization. Dan Grossman. Winter 2013. Delayed evaluation. For each language construct, the semantics specifies when . subexpressions. get evaluated. In ML, Racket, Java, C:. Lecture 17. Implementing Languages Including Closures. Dan Grossman. Autumn . 2018. Typical workflow. Autumn 2018. 2. CSE341: Programming Languages. "(. fn. x => x x) 4". Parsing. Call. Function. Lecture 19. Introduction to Ruby and OOP. Dan Grossman. Autumn . 2018. Ruby logistics. Next two sections use the Ruby language. http://. www.ruby-lang.org/. Installation / basic usage instructions on course website. Lecture 22. OOP . vs. Functional Decomposition; Adding Operators & Variants; . Double-Dispatch . Dan Grossman. Autumn . 2018. Breaking things down. In functional (and procedural) programming, break programs down into . The Desired Brand Effect Stand Out in a Saturated Market with a Timeless Brand