Computer Science - ASCII and Unicode ASCII and Unicode explained in brief with examples and ASCII table.

1. Computer Science
(A Level)
ASCII and Unicode

2. A binary representation of a
particular letter, number or special
character
(Definitions)

3. • ASCII stands for “American Standard Code for Information
Interchange”
• It is the most common format for text files in computers on the
internet
• IT MAPS BINARY TO LETTERS/NUMBERS
• It represents text which makes it possible to transfer data from
one computer to another
• ASCII was used to facilitate communication between computers
by using the common language code
ASCII

4. ASCII
Limitations of ASCII
• Can only represent 127 or 255 characters
• Can only code for the standard English language
characters (not for others like Chinese/Arabic)

5. ASCII Table

6. • Unicode is an international and multilingual text character and coding
system
• Unicode uses more bits and therefore can be used for more character
combinations
• It was introduced so that lots of different characters from different
languages could be easily represented and entered
• It facilitates communication between devices all around the world
without relying on translation
Unicode

7. • Joe Becker published a draft of Unicode in August 1988.
Companies such as Apple and Xerox were involved in its creation
Unicode
UTF – 8 = Extended ASCII
= 8 Bits
UTF – 16 = Expands to western languages
= 16 Bits
UTF – 32 = Most complete character set
= 32 Bits
UNICODE: