Data Coding And Information Decoding
 Educational level: this is a secondary education resource.
 Resource type: this resource is a lesson.
 Completion status: this resource is ~75% complete.

## Unique Code

Data are Numbers, Text, Sounds, Image, Animation, Video, etc.; in order to define them in the real world, we are using Numbers (0,...9), an Alphabet (A,...Z) and symbols (@,[,,...) or a combination of them, for example:

• 2012 ( Number )
• Wikiversity ( Alphabet )
• 3
• X=(Y*Z) W-U ( combination of Alphabet and symbols )
• N123 ( combination of Alphabet and Number )

Computers, however, don't understand the definitions for Numbers (0,...9), the Alphabet (A,...Z) and symbols (@,[,,...), so in order to process those pieces of information a unique code must be assigned to each of them. The unique code for Numbers (0,...9), the Alphabet (A,...Z) and symbols (@,[,,...) is a binary numeral.

show 1,0 in binary numbers

In practical use, each "0" and "1" in binary number uses a Physical attribute that is electrical or magnetic. The smallest part of that Physical attribute is named "Bit", the existence of the Physical attribute is "1", and the absence of the Physical attribute is "0"; 8-bit grouped up are called 1 Byte (so 1 byte=8 bit).

The binary numeral system, or base-2 number system, represents numeric values using two symbols - 0 and 1.

Examples:

• numerical value " 0 " is 0. The unique code for 0 is -> 00000000
• numerical value " 1 " is 1. The unique code for 1 is -> 00000001
• numerical value " 2 " is 10. The unique code for 2 is -> 00000010
• numerical value " 3 " is 11. The unique code for 3 is -> 00000011
• numerical value " 4 " is 100. The unique code for 4 is -> 00000100
• numerical value " 5 " is 101. The unique code for 5 is -> 00000101
• numerical value " 6 " is 110. The unique code for 6 is -> 00000110
• numerical value " 7 " is 111. The unique code for 7 is -> 00000111
• numerical value " 8 " is 1000. The unique code for 8 is -> 00001000
• numerical value " 9 " is 1001. The unique code for 9 is -> 00001001

Alphabet (A,...Z):

• The unique code for " A " is -> 01000001
• The unique code for " B " is -> 01000010
• The unique code for " C " is -> 01000011
• .....
• .....
• .....
• The unique code for " Z " is -> 01011010

for symbols ():

• The unique code for " @ " is -> 01000000
• The unique code for " [ " is -> 01011011
• The unique code for " " is -> 01011100
• .....
• .....
• .....
File:Pals2.png
show number 10101010

## Distinction between "Data" and "Information"

This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

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