CS101 Lecture Notes with Slides 9.6.11

CS101 Lecture Notes with Slides 9.6.11 - We x?!" What...

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Unformatted text preview: We x?!" What is Computer Science? computer science, :1. the science the! deals with the theory and k / methods of pmcessiug information in digital computers, the design of “” 311$ computer hardware and sojfware, and the applimli‘ons of computers. Random House Unabridged Dictionary, 2006. Ext/hairs (:9wa 50mm? Cg} we dais Mai/w M76 9:) WA”? is a, @wft’g‘K/g M Wigffi hawst M dam“) a CS is NOT Science! The fundamental ideas of CS are: — Encoding information — Algorithms E — Protocols l — Abstraction s Numbered Code: Good Enough? What’s good about the numbered code? What's not so good about it? 11 A protocot is a set of rules governing the exchange or transmission of data between devices. Abstraction Abstraction is about hiding unnecessary details and retaining only the relevant information. Transmit user Receive Dam Dara Nets/)é’fi/ mma-r Physicat Link ---——-—a- 19 Data and Information Data is a fact pattern: .lflUHHiiGlllUififlUiUlUUUUUllUH‘JU. $011010“!IOOiGGIHEGUDOGIOHGOiI .llimlfllflllllfifllimflflotmflifilllfll 101011}“1010101HHOOSUHIDHODEI .1031000031106011HGOIOHIUODIO!“ Information is how we interpret that Facebook helps you connect and share wtlh pattern: the people in yourtlfe. .1233 r t 20 10 What isa Computer? f { afgrhfiéfil at .4, “gab/“M otjarjémy What is a computer, anyway? 75°29" [A computer takes an input, applies a I process, and produces an output. Give some examples: . We: Mimi if?) X 61 Ww'fif (Aéacegfiflzéffwzér) 1: iESLWWLjevgr-t" fimt’en 11 _ 7; ‘3th Jk‘fb 3% fkefloj' hat You {hesa — Computer Science is NOT a Science —Algorithms, Encoding Information, Protocols, and Abstraction. ~ Data vs. Information — Computers — Hardware/Software wit/EV (:3!wa gétrméb (<3 mf" it @ ' “ a 'r' in {My} 07%: o- ‘ffitt mfiwfirwfimfi We 3.. . w r was: r: m ,-g%~W em Ma Ma Mew? ', " ‘ (mm: A PAEEéAX'jRD 'U; A, MW "mm a M HAS-IT 51:: if?“ 39“” _ “HA” ("AFUKCTERS’ i one - " = . mm A mix or .- LETTERE Mia» “anemia. Hde A6631 rm: ? 26 13 ...
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This note was uploaded on 12/16/2011 for the course CS 101 taught by Professor Stevens during the Fall '08 term at BU.

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CS101 Lecture Notes with Slides 9.6.11 - We x?!" What...

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