Here is the ASCII standard for translating the integer represented by 7 (usually out of 8) bits in memory to a specific character. Most of the integers from 0 through 31 represent special signals to the computer, rather than what you normally consider to be characters.
Decimal Hexi- ASCII Equivalent Definition
Number decimal Character Control
value Character
------------------------------------------------------------
0 0 nul Ctrl-@ Null
1 1 soh Ctrl-A Start of heading
2 2 stx Ctrl-B Start of text
3 3 etx Ctrl-C End of text
4 4 eot Ctrl-D End of transmission
5 5 enq Ctrl-E Enquiry
6 6 ack Ctrl-F Acknowledge
7 7 bel Ctrl-G Bell
8 8 bs Ctrl-H Backspace
9 9 ht Ctrl-I Horizontal tab
10 0a nl Ctrl-J Line feed
11 0b vt Ctrl-K Vertical tab
12 0c ff Ctrl-L Form feed
13 0d cr Ctrl-M Carriage return
14 0e so Ctrl-N Shift out
15 0f si Ctrl-O Shift in
16 10 dle Ctrl-P Data link escape
17 11 dc1 Ctrl-Q Device control 1
18 12 dc2 Ctrl-R Device control 2
19 13 dc3 Ctrl-S Device control 3
20 14 dc4 Ctrl-T Device control 4
21 15 nak Ctrl-U Negative acknowledge
22 16 syn Ctrl-V Synchronous idle
23 17 etb Ctrl-W End of transmission
24 18 can Ctrl-X Cancel
25 19 em Ctrl-Y End of medium
26 1a sub Ctrl-Z Substitute
27 1b esc Ctrl-[ Escape
28 1c fs Ctrl-\ File separator
29 1d gs Ctrl-] Group separator
30 1e rs Ctrl-^ Record separator
31 1f us Ctrl-_ Unit separator
32 20 sp Space
33 21 !
34 22 "
35 23 #
36 24 $
37 25 %
38 26 &
39 27 ' Apostrophe
40 28 (
41 29 )
42 2a *
43 2b +
44 2c , Comma
45 2d - Minus
46 2e . Period
47 2f / Divide
48 30 0
49 31 1
50 32 2
51 33 3
52 34 4
53 35 5
54 36 6
55 37 7
56 38 8
57 39 9
58 3a : Colon
59 3b ; Semicolon
60 3c <
61 3d =
62 3e >
63 3f ?
64 40 @ At symbol
65 41 A
66 42 B
67 43 C
68 44 D
69 45 E
70 46 F
71 47 G
72 48 H
73 49 I
74 4a J
75 4b K
76 4c L
77 4d M
78 4e N
79 4f O
80 50 P
81 51 Q
82 52 R
83 53 S
84 54 T
85 55 U
86 56 V
87 57 W
88 58 X
89 59 Y
90 5a Z
91 5b [
92 5c \ Backslash
93 5d ]
94 5e ^ circumflex
95 5f _ Underline
96 60 ` Backward Apostrophe
97 61 a
98 62 b
99 63 c
100 64 d
101 65 e
102 66 f
103 67 g
104 68 h
105 69 i
106 6a j
107 6b k
108 6c l
109 6d m
110 6e n
111 6f o
112 70 p
113 71 q
114 72 r
115 73 s
116 74 t
117 75 u
118 76 v
119 77 w
120 78 x
121 79 y
122 7a z
123 7b {
124 7c | Vertical line
125 7d }
126 7e ~ Tilde
127 7f del Delete
Maintained by John Mahaffy : jhm@cac.psu.edu