Computer code

i. BCD code:

• BCD stands for binary coded decimal.
• BCD is a family of representation of numerals, upper case letters and some space special and control  characters.
• It is designed by 6-bit of character and 64 characters can be coded.

ii. EBCDIC(Extended binary coded decimal interchange code):

• It is 8-bit character set that was developed by IBM .
• It was the character set used on most computer manufactured by IBM.
• It uses 8-bit for each character or symbol and 256 possible characters can be coded.

iii. ASCII( American standard code for information interchange):

• ASCII pronounced “askee” is the most common alpha numeric code used to represent characters, numbers and symbols.
• ASCII code uses 7 or 8-bit for data representation. With 7-bit only 128 character can be coded and with 8-bit we can code 256 characters.
• Characters include letters (A to Z, a to z), number (0-9),punctuation marks(!.,’ ‘ “), special characters (@ #$) and some control characters.

           EX: A=01000001
                 a= 01100001
iv. UNICODE:

• UNICODE set of universal code it is an industry standard allowing computers to represent and manipulate text expressed in the most and the world writing system.
• UNICODE provides a unique number, for every character.
• Each character of symbol in UNICODE designed by a 32-bit number and the code can defined characters or symbols.

Sr. no.	Name of code	Bit	Character
1.	BCD		16 64
2.	EBCDIC		256
3.	ASCII		128 256
4.	UNICODE