ASCII value/code
A computer is a digital electronic machine that processes discrete data. It operates with data expressed in bits(i.e. binary digits 0 and 1). Each individual character is numerically encoded with a unique binary code which is used for information transfer/interchange within a computer or any other digital system. The character includes all the alphabets(both uppercase and lowercase), symbols, digits(0 to 9), escape sequences and functions. The binary code depends on the character encoding standard used. ASCII and EBCDIC are the most popular character encoding standards.The significance of character encoding standard is to convey the characters to the digital systems or computers in binary codes. A digital system can transfer, understand, or process only binary values. So it is mandatory to provide every information to a computer in the form of binary codes. The encoding standard acts as a mediator and converts input characters to numeric(binary) values which are understood and processed by computers. It also converts processed binary output back to characters.
EBCDIC stands for Extended Binary Coded Decimal Interchange Code. It is a character encoding standard which is mostly used in IBM mainframe computers. In this character set, each individual character is numerically encoded with a unique 8-bit combination which is distinctly different from the ASCII character set.
ASCII stands for American Standard Code for Information Interchange. ASCII is the most popular scheme which assigns all characters with a unique binary combination(integer value). ASCII codes are the decimal representation of the corresponding binary codes used by the digital system. It has a unique 7-bit binary combination for 128 characters which are as follows.
Range or Examples No of Characters Remarks
A-Z 26 Uppercase English alphabets
a-z 26 Lowercase English alphabets
0-9 10 Digits
!, ", $, %, {, [, etc. 32 Punctuation marks and symbols
\n(LF), \f(FF), etc. 31 Control characters and Escape sequences
(Blank) 1 Space character
\0 or NULL 1 Null character
DEL 1 Delete character
ASCII Character set |
|||||||
ASCII
Value
|
Character
|
ASCII
Value
|
Character
|
||||
0
|
NUL
|
64
|
@
|
||||
1
|
SOH
|
65
|
A
|
||||
2
|
STX
|
66
|
B
|
||||
3
|
ETX
|
67
|
C
|
||||
4
|
EOT
|
68
|
D
|
||||
5
|
ENQ
|
69
|
E
|
||||
6
|
ACK
|
70
|
F
|
||||
7
|
BEL
|
71
|
G
|
||||
8
|
BS
|
72
|
H
|
||||
9
|
HT
|
73
|
I
|
||||
10
|
LF
|
74
|
J
|
||||
11
|
VT
|
75
|
K
|
||||
12
|
FF
|
76
|
L
|
||||
13
|
CR
|
77
|
M
|
||||
14
|
SOH
|
78
|
N
|
||||
15
|
SI
|
79
|
O
|
||||
16
|
DEL
|
80
|
P
|
||||
17
|
DC1
|
81
|
Q
|
||||
18
|
DC2
|
82
|
R
|
||||
19
|
DC3
|
83
|
S
|
||||
20
|
DC4
|
84
|
T
|
||||
21
|
NAK
|
85
|
U
|
||||
22
|
SYN
|
86
|
V
|
||||
23
|
ETB
|
87
|
W
|
||||
24
|
CAN
|
88
|
X
|
||||
25
|
EM
|
89
|
Y
|
||||
26
|
SUB
|
90
|
Z
|
||||
27
|
ESC
|
91
|
[
|
||||
28
|
FS
|
92
|
\
|
||||
29
|
GS
|
93
|
]
|
||||
30
|
RS
|
94
|
^
|
||||
31
|
US
|
95
|
_
|
||||
32
|
(blank)
|
96
|
`
|
||||
33
|
!
|
97
|
a
|
||||
34
|
"
|
98
|
b
|
||||
35
|
#
|
99
|
c
|
||||
36
|
$
|
100
|
d
|
||||
37
|
%
|
101
|
e
|
||||
38
|
&
|
102
|
f
|
||||
39
|
'
|
103
|
g
|
||||
40
|
(
|
104
|
h
|
||||
41
|
)
|
105
|
i
|
||||
42
|
*
|
106
|
j
|
||||
43
|
+
|
107
|
k
|
||||
44
|
,
|
108
|
l
|
||||
45
|
-
|
109
|
m
|
||||
46
|
.
|
110
|
n
|
||||
47
|
/
|
111
|
o
|
||||
48
|
0
|
112
|
p
|
||||
49
|
1
|
113
|
q
|
||||
50
|
2
|
114
|
r
|
||||
51
|
3
|
115
|
s
|
||||
52
|
4
|
116
|
t
|
||||
53
|
5
|
117
|
u
|
||||
54
|
6
|
118
|
v
|
||||
55
|
7
|
119
|
w
|
||||
56
|
8
|
120
|
x
|
||||
57
|
9
|
121
|
y
|
||||
58
|
:
|
122
|
z
|
||||
59
|
;
|
123
|
{
|
||||
60
|
<
|
124
|
|
|
||||
61
|
=
|
125
|
}
|
||||
62
|
>
|
126
|
~
|
||||
63
|
?
|
127
|
DEL
|
||||
