Punch a pillow

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Punch a pillow
http//www.imdb.com/title/tt0048960/

• Billy Crystal in Analyze This (1999)

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Computer Science 101Lecture 18
linuxvm.org/ Images/TuxonVM.gif

• Spring Semester 2008
• Wednesday, February 27
• Week 7/18
• Albert H. Carlson

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Announcements

• Due March 7 Midterm Essay
• Bring your FLASH drive to lab
• Bring your Castro Book on HTML to lab. Also,
  study the assigned reading to this point so you
  are familiar with it.

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Access

• A general data base
• We will discuss data bases later in class
• Comes with the Office Professional package
• Many office uses

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Other Application Programs

• Adobe Reader pdf
• Photoshop picture editor
• Paint drawing program
• Wave pad Music recorder and editor
• Coreftp Communication
• Internet Explorer/Mozilla HTML web browsers
• Arachnophilia HTML editor

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Software

• There are several levels of software
• Programming instruction sets are known as
  Languages

Fifth Generation (Object Oriented)
Structured Languages
Interpreted Languages
Compiler
Assembly Language
Interpreter
Assembler
Machine Language
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What is a Language?

• A set of instructions that allow the programmer
  to give instructions to a computer to accomplish
  a task
• The instructions are well understood to mean ONE
  thing when they are written
• Languages have syntax rules
• Languages have semantics (meanings)
• Use symbols understood by programmers

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Languages

• Machine Language or microcode
• Is only 1s and 0s
• Tells different control points in the computer
  to turn on or off
• The lowest level of all languages
• All instructions must be translated into this
  language
• Different for each computer
• Fast, but very hard to remember

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Assembler

• One level of abstraction up from machine language
• Easier to remember
• Uses neumonics, like add R0, R1
• Register based
• Some use the accumulator
• Fast, but only really used on real time
  applications

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Interpreted Languages

• Use something like an assembler to go right to
  microcode
• Looks at the instruction and has enough
  information to execute the code directly
• Requires more up front work than compiled
  languages

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Structured/Functional Languages

• Arise from the work of Dijkstra
• Formally defined
• Contain standard structures
• The assignment
• Decision statements
• Loops
• Functions with parameter passing
• Most commonly used language

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Object Oriented (OO)

• Not linear ie, not all instructions follow one
  after the other
• Does operation on objects
• Uses inheritance when classes of objects are
  defined
• Very useful when many programmers work together

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Questions?