Review - Midterm Review 25 February 2008 What does a...

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Midterm Review 25 February 2008
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What does a Computer Do Well? Intelligence amplifier amplifies our ability to perform mental activities “power tools” for the mind Can process much more information Does repetitive tasks quickly and correctly Check things more quickly Removes people from boring tasks Manipulates forms and data
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What a Computer Does Very simple machine: executes exactly what it is told Executes instructions that define algorithms Instructions stored in the computer are the software We can change them Instructions deal with holders of data, not the data itself Gives them the ability to deal with any data Makes computers the most adaptable tool
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Logical organization of computer system Inputs CPU Memory Outputs Data/info in use now Storage LOTS of programs and data files stored here programs data information
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What is stored in the Computer? Bits: ones and zeroes Why? Easy to build To make managing information easier, stored in fixed size packets: Bytes (8 bits), Half words, Words, . ..
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Storing Numbers: Binary Positional System 1 0 = 0 0 0 0 = 0 0 1 0 = 8   4   2   1 = 0 0 0 1 0 1 0 0 = = 0 0 1 1 0 1 2 3 4
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Data Types Computer doesn’t know what the bits represents or what format is being used Computer assumes that the instructions know the format of the data
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Data Types Numbers: integers and floating point numbers (scientific notation) Why do we need floating point numbers? Text: Unicode, double byte Languages and symbols (Word insert symbol) Pictures: pixels A very fine needlepoint How to represent color? Sound: different formats Instructions
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The Internet What is it? The infrastructure that connects identified computers Links = the wires Routers = the boxes that connect them World Wide Web Computers that contain information to be shared Servers
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Need to know where to go and how to et there Who identified by IP address Every machine that is connected to the network has one Routers know how to get there
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This note was uploaded on 02/23/2012 for the course COMP 553 taught by Professor Ajay during the Spring '12 term at Ill. Chicago.

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Review - Midterm Review 25 February 2008 What does a...

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