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Computing Science (A Dance In The Dark Every Monday (Analysis, Design,…
Computing Science
A Dance In The Dark Every Monday
Analysis
Design
Integrate
Testing
Documentation
Evaluate
Maintenance
Used in web developing or software developing.
Computer systems
Binary
in 8 bit binary, the first digit on the left is equal to 128, then each one is halved until you get to 1. (128, 64, 32, 16, 8, 4, 2, 1)
8 bit binary is 8 1's or 0's in a string E.G. 10010110
Also known as the computer language
Uses of binary
Images
Bitmap
Every pixel is stored individually
The colour depth of a bitmapped graphic is 24 for true colour, this means that a pixel can be one of 16777216 different colours.
Vector
Stored using geometric shapes (rectangle, ellipse, line, polygon) and attributes (colour, position, line colour)
Text
ASCII
American Standard Code for Information Interchange
It uses 7 bits per character.
There are 128 different possible characters.
Extended ASCII
American Standard Code for Information Interchange Extended
It takes up 8 bits or 1 byte per character.
There are 256 different possible characters.
Unicode
Takes up 16 bits or 2 bytes per character
35,536 different possible characters
5 box diagram
Backing storage
This is connected to the CPU through data and address busses to carry information.
Stores information not being used at that moment. Each piece of information is stored at it's own unique address.
Input devices
Fore example: Mouse or Keyboard
Main memory
Random Access Memory
Can be written to and read from
Stores information about files or programs that are being used.
Needs power to store information. Looses data when the power is turned off.
Read Only Memory
Stores the operating system.
Can only be read, not written to.
Stores information without power.
Output devices
For example: Monitor or Speakers
Central Processing Unit
Registers
Stores information waiting to be processed.
Control Unit
Controls all of the operations in the computer
Arithmetic & Logic Unit
Carries out arithmetic; Plus, minus, divide, multiply
Carries put logic; If, Or, And
html
#
Tags
<H1,2,,3,4,5,6>
if there is an H1 tag then whatever in that tag will be top of the search bar on google because of the algorithms google use.
anchor tag: <a href="url">Anchor text</a>
Hyperlink
<link rel="stylesheet" type="text/css" href="styles.css">
Links an external style sheet named "styles.css"
Use in the head
ID's
In an external style sheet it is #header{attributes}
Clases
In an external style sheet it is .header{attributes}
DIVs
Divs are used to divide a page into sections that are separate from each other other.
Attributes
Color (American spelling)
Text-align
font-family
font-size
Programming
Subprograms
A subprogram is a chunk of code that has been named to suit what that piece of code.
The subprgrams are all listed, in order, between "on mouseUp" and "end mouseUp"
When a subprogram is completed, the program will go to the end of that subprogram then see the next one ad jump to that piece of code.
Variables
Variables are listed above on mouseUp with "Global" at the start of that line.
Variables are given a value by using "put it into variable" as a line of code. "it" is whatever the person answered in the question in the line above.
Web D&D
#
Navigation
Heirarchical
In this 4 page website, from page 1, there is a link to and from all of the other pages .
Linear
In a 4 page website, you would go from page 1 to page 2 to page 3 to page 4 and back to page 1. `
