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The Case for Computer Science

The Case for Computer Science. CS 1110/1111 – Introduction to Programming. The Course Goals. To teach the skill of programming To teach the art of computer science. Look around…. Where do you see computing at work in the world?. A question. First, what is an operating system?

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The Case for Computer Science

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  1. The Case for Computer Science CS 1110/1111 – Introduction to Programming

  2. The Course Goals • To teach the skill of programming • To teach the art of computer science 2

  3. Look around… • Where do you see computing at work in the world? 3

  4. A question • First, what is an operating system? • Second, how many operating systems have you used? 4

  5. Really? How many? • Think of all the devices that contain operating systems of some kind… 5

  6. So I ask again… • Where do you see computing at work in the world? • Heck, look just in this room! In your dorm room / apartment! 6

  7. A system of interest • SIS • What's wrong with SIS? • (remember – we only have so much time in this class today…) 7

  8. Cri-SIS • Thoughts? 8

  9. Okay, that was cathartic • Now let's back up for a minute • Why do we have SIS? • What's the underlying “problem” it's trying to solve? • Is this fundamentally a “computer science” problem? If so, what's the problem? If not, what discipline does it come from? • Activity: A Cri-SIS • Groups of 3 or 4; Answers these questions 9

  10. A Big, Scary Computer Science Word • “Algorithm” • Definition? 10

  11. Algorithms – What do they mean? • A step-by-step process for solving a problem • A recipe! 11

  12. Well… what's a program? • A program is an implementation of an algorithm that a computer can understand 12

  13. The Challenge Electricity Functionality 13

  14. Abstraction • Split up the problem into several layers • Each intermediate layer will: • Use what its lower layer provides to do something • Hide the characteristics of the layers below it to the layer above • The lower layers are in hardware and the higher layers in software Provide the required functionality to the user Get electricity into the computer 14

  15. Let's Pause for a Moment • What is a programming language? • A language that allows you to express computations performed by a “machine”. • But, a machine has several layers. • Each layer has its own programming language! • The language allows the functionality provided by a layer to be used without knowing how it is implemented (Abstraction) • What does a language do? • Provide representations for data • Define operations on the data 15

  16. Assembly Language(we're now in software land) • Data:A collection of logical bits • Operations: ADD, SUB, MULTIPLY,… (instructions) • A sequence of instructions that perform a computation form a program. • A program uses data that is stored in memory. .data hellostring: .ascii "Hello “ .asciiz "World!\n" .text main: la $a0, hellostring li $v0, 4 syscall li $v0, 10 syscall 16

  17. High-Level Language (HLL) • Uses data representations and constructs that are much easier to use to convert the high-level computation steps (algorithm) to a computer program to achieve the desired functionality. 17

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