Data plus a code ? information - PowerPoint PPT Presentation

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Data plus a code ? information

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Title: Data plus a code ? information


1
Data plus a code ? information
Skills none IT concepts text code
This work is licensed under a Creative Commons
Attribution-Noncommercial-Share Alike 3.0
License.
2
Where does this topic fit?
  • Internet concepts
  • Applications
  • Technology
  • Implications
  • Internet skills
  • Application development
  • Content creation

3
40 bits of data
0100110001100001011100100111001001111001
Do you see a pattern or is it random? Random
bits convey no information.
4
5 bytes of data
0100110001100001011100100111001001111001
01001100 01100001 01110010 01110010 01111001
Do you see a pattern?
5
5 bytes of data
0100110001100001011100100111001001111001
01001100 01100001 01110010 01110010 01111001
These bytes are the same highly unlikely if
these were random bits.
6
A code
7
Data plus a code ? information
0100110001100001011100100111001001111001
L 01001100
a 01100001
r 01110010
r 01110010
y 01111001
L a r r y
8
Random bits convey no information. The amount
of information in 1,000,000,000,000,000 random
bits is 0. Data must be organized to convey
information. A code allows a person (or a
computer) to find that organization.
9
Codes must be standardized if we are to exchange
information. We used a portion of the
ISO-8859-1 code in this example. It is the
default code in all popular Web browsers.
10
A few questions
11
What would happen if a program tried to display a
page of text that was created by a program using
a different code than expected?
12
The symbols 09 may be used in numeric and text
data. Which of these is numeric and which is
text?
Height (inches) 70 data type?
Weight (pounds) 170 data type?
Social security number 544678793 data type?
13
Data plus a code ? information
Skills none IT concepts text code
This work is licensed under a Creative Commons
Attribution-Noncommercial-Share Alike 3.0
License.
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