Data Representation

• What do computers use to represent data?

  Binary
• Convert the number 69 into binary.


  0100101
• What is the range of numbers 8 bit binary can use?

  0 to 255
• how many bits is used to store the word 'Hello' in extended ASCII?

  40
• Describe how bit mapped graphics work.

  Every pixel is stored as a binary value (either a 0 or a 1) called a bit.
• How are vector graphic stored on a computers memory?

  A list of attributes
• Describe common vector graphic objects

  Polygon - a shape that has more than 3 sides (eg. triangles)

  Ellipse - a circle

  Rectangle

  Line
• Describe common vector graphic object attributes.

  co-ordinates

  fill colour

  line colour