Data Representation

• How do computers store data?

  Binary digits
• Why do computers use binary?

  • Simplicity
  • Storage
  • Signal degradation
• What numbers are used in binary?

  128, 64, 32, 16, 8, 4, 2, 1
• What is the biggest numbers stored in binary?

  255
• What are the three elements of floating point representation?

  • Base
  • Exponent
  • Mantissa
• What is the exponent?

  The power
• What is the mantissa?

  The digits that make up the number
• How many bits does Extended ASCII cover?

  8 bits
• What do non printable characters do?

  Do not appear on the screen
• How do vector graphics store images?

  Objects and attributes
• What are examples of vector graphic objects?

  • Rectangles
  • Elipses
  • Polygons
  • Lines
• What are examples of vector graphic attributes?

  • Coordinates
  • Fill colour
  • Line colour
• Can vector graphics be used to store a photographic image?

  NO
• What are the two ways to store an image?

  Vector and bitmap graphics
• How do bitmap graphics store images?

  Each binary value represents a pixel
• How many bits is true colour?

  24 bits
• How many pixels is a mega pixel?

  One million