ascii - the ASCII character set encoded in octal, decimal, and hexadecimal
DESCRIPTION
ASCII is the American Standard Code for Information Interchange.
It is a 7-bit code. Many 8-bit codes (such as ISO 8859-1, the
Linux default character set) contain ASCII as their lower half.
The international counterpart of ASCII is known as ISO 646.
The following table contains the 128 ASCII characters.
C program '\X' escapes are noted.
{}
Oct
Dec
Hex
Char
Oct
Dec
Hex
Char
000
0
00
NUL '\0'
100
64
40
@
001
1
01
SOH
101
65
41
A
002
2
02
STX
102
66
42
B
003
3
03
ETX
103
67
43
C
004
4
04
EOT
104
68
44
D
005
5
05
ENQ
105
69
45
E
006
6
06
ACK
106
70
46
F
007
7
07
BEL '\a'
107
71
47
G
010
8
08
BS '\b'
110
72
48
H
011
9
09
HT '\t'
111
73
49
I
012
10
0A
LF '\n'
112
74
4A
J
013
11
0B
VT '\v'
113
75
4B
K
014
12
0C
FF '\f'
114
76
4C
L
015
13
0D
CR '\r'
115
77
4D
M
016
14
0E
SO
116
78
4E
N
017
15
0F
SI
117
79
4F
O
020
16
10
DLE
120
80
50
P
021
17
11
DC1
121
81
51
Q
022
18
12
DC2
122
82
52
R
023
19
13
DC3
123
83
53
S
024
20
14
DC4
124
84
54
T
025
21
15
NAK
125
85
55
U
026
22
16
SYN
126
86
56
V
027
23
17
ETB
127
87
57
W
030
24
18
CAN
130
88
58
X
031
25
19
EM
131
89
59
Y
032
26
1A
SUB
132
90
5A
Z
033
27
1B
ESC
133
91
5B
[
034
28
1C
FS
134
92
5C
\ '\\'
035
29
1D
GS
135
93
5D
]
036
30
1E
RS
136
94
5E
^
037
31
1F
US
137
95
5F
_
040
32
20
SPACE
140
96
60
`
041
33
21
!
141
97
61
a
042
34
22
"
142
98
62
b
043
35
23
#
143
99
63
c
044
36
24
$
144
100
64
d
045
37
25
%
145
101
65
e
046
38
26
&
146
102
66
f
047
39
27
'
147
103
67
g
050
40
28
(
150
104
68
h
051
41
29
)
151
105
69
i
052
42
2A
*
152
106
6A
j
053
43
2B
+
153
107
6B
k
054
44
2C
,
154
108
6C
l
055
45
2D
-
155
109
6D
m
056
46
2E
.
156
110
6E
n
057
47
2F
/
157
111
6F
o
060
48
30
0
160
112
70
p
061
49
31
1
161
113
71
q
062
50
32
2
162
114
72
r
063
51
33
3
163
115
73
s
064
52
34
4
164
116
74
t
065
53
35
5
165
117
75
u
066
54
36
6
166
118
76
v
067
55
37
7
167
119
77
w
070
56
38
8
170
120
78
x
071
57
39
9
171
121
79
y
072
58
3A
:
172
122
7A
z
073
59
3B
;
173
123
7B
{
074
60
3C
<
174
124
7C
|
075
61
3D
=
175
125
7D
}
076
62
3E
>
176
126
7E
~
077
63
3F
?
177
127
7F
DEL
{}
HISTORY
An
ascii manual page appeared in Version 7 of AT&T UNIX.
On older terminals, the underscore code is displayed as a left arrow,
called backarrow, the caret is displayed as an up-arrow and the vertical
bar has a hole in the middle.
Uppercase and lowercase characters differ by just one bit and the
ASCII character 2 differs from the double quote by just one bit, too.
That made it much easier to encode characters mechanically or with a
non-microcontroller-based electronic keyboard and that pairing was found
on old teletypes.
The ASCII standard was published by the United States of America
Standards Institute (USASI) in 1968.
For convenience, let us give more compact tables in hex and decimal.
2 3 4 5 6 7 30 40 50 60 70 80 90 100 110 120
------------- ---------------------------------
0: 0 @ P ` p 0: ( 2 < F P Z d n x
1: ! 1 A Q a q 1: ) 3 = G Q [ e o y
2: " 2 B R b r 2: * 4 > H R \ f p z
3: # 3 C S c s 3: ! + 5 ? I S ] g q {
4: $ 4 D T d t 4: " , 6 @ J T ^ h r |
5: % 5 E U e u 5: # - 7 A K U _ i s }
6: & 6 F V f v 6: $ . 8 B L V ` j t ~
7: ' 7 G W g w 7: % / 9 C M W a k u DEL
8: ( 8 H X h x 8: & 0 : D N X b l v
9: ) 9 I Y i y 9: ' 1 ; E O Y c m w
A: * : J Z j z
B: + ; K [ k {
C: , < L \ l |
D: - = M ] m }
E: . > N ^ n ~
F: / ? O _ o DEL
