Page 58 - ComputerScience_Class_11

Character Zone bit Numeric bit Octal value
Z 01 1001 31
1 00 0001 01
2 00 0010 02
3 00 0011 03
4 00 0100 04
5 00 0101 05
6 00 0110 06
7 00 0111 07
8 00 1000 10
9 00 1001 11
0 00 1010 12
+ 11 0000 60
_
10 0000 40
* 10 1100 54
/ 01 0001 21
= 00 1011 13
( 01 1100 34
) 11 1100 74
. 11 1011 73
The representations are shown below as examples:

Example 1: Represent JAVA as 6-bit BCD code.
Answer: The BCD binary notation of the characters are given below:
J = 10 0001
A = 11 0001
V = 01 0101
Thus, the BCD equivalent is 100001 110001 010101 110001.
Example 2: Write the Octal notation in BCD coding for the word BAT.
Answer: The BCD Octal notation of the characters are given below:
B = 62
A = 61
T = 23
Thus, the BCD octal equivalent is 62 61 23.

2.1.2 American Standard Code for Information Interchange (ASCII)
ASCII is the most popular coding scheme used as industry standard in computers and on the web. It was introduced
7
in 1960. Originally, ASCII was designed as a 7-bit character set having 2 or 128 characters. It could represent all digits
from 0 to 9, uppercase and lowercase English alphabets and some special characters. The ASCII codes of 128 characters
are listed in the table below:

Decimal Octal Hexadecimal Binary Value
000 000 000 00000000 NUL
001 001 001 00000001 SOH
002 002 002 00000010 STX
003 003 003 00000011 ETX
004 004 004 00000100 EOT

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