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Announcements & Review

Announcements Accounts? Pair in discussion sections PAI 3.70 The Web page works www.cs.utexas.edu/users/mckinley/305j. Last Time Syllabus About me & you Fun, high paying CS jobs. Announcements & Review. Today. What is language?

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Announcements & Review

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  1. Announcements Accounts? Pair in discussion sections PAI 3.70 The Web page works www.cs.utexas.edu/users/mckinley/305j Last Time Syllabus About me & you Fun, high paying CS jobs Announcements & Review Lecture 2: Language

  2. Today • What is language? • a system for communication, comprised of a set of symbols and a set of rules, a grammar, that manipulates them. • What’s a computer language? • How do we communicate with a computer? Lecture 2: Language

  3. Noam Chomsky • Born 1928 • MIT Professor 1955-present • Linguist/Computer Scientist • Changed how we think about language • all computer languages derive from his work Lecture 2: Language

  4. Language Acquisition • Universal Grammars • Roger Bacon (1214-1294) • “Nativist Theory” - Noam Chomsky • Language is innate • You are born with language principals • Listening to others (eg, parents) fills in your brain language template Lecture 2: Language

  5. Language Acquisition “By Instruction” - Catherine Snow • born 1945, McGill PhD 1971 • Harvard 1980--present • Psychologist • Parent & peer instruction • read more on language: en.wikipedia.org/wiki/Language_acquisition Lecture 2: Language

  6. Language Hypotheses After about 12, sophisticated fluent language acquisition is not possible - Erick Lenneberg Since children of immigrants are fluent in new language, it must be innate not learned- Dereck Bickerton Lecture 2: Language

  7. Language Vocabulary - the words in a language Grammar - the study of the classes of words, their inflections, and their functions and relations in the sentence Syntax • the way in which linguistic elements (words) are put together to form constituents (phrases or clauses) • a connected or orderly system : harmonious arrangement of parts or elements Semantics - what it means Lecture 2: Language

  8. Language Modeling Universal grammar • with a limited set of rules, humans can produce an infinite variety of sentences Grammar classifications & hierarchies • Noam Chomsky Computer scientists use these formal grammars to describe and check computer languages Lecture 2: Language

  9. Computer Languages • High-level computer languages • what you want to read & write • examples? • Assembly language (Low-level) • closer to the computer, but still human readable • some humans write this form, but YUCK! • Compiler produces this form from high-level form • How hard is this translation? • Machine language or object code • binary instruction representation • Compiler produces this form from assembly Lecture 2: Language

  10. Discussion • Computer speaks to us? • What does it say? • We speak to it, what can we say to it? • What can a computer do? • How can we express what we want the computer to do? Lecture 2: Language

  11. Questions? Lecture 2: Language

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