APPENDIX B

ASCII Character Code Definitions

The first 32 American Standard Code for Information Interchange (ASCII) characters provide control functions. Many of these haven't been referenced in this book but are included here for completeness. In Table B-1, only the first 128 characters are included. The remaining 128 characters include further special symbols and letters for national character sets.

Table B-1. ASCII Character Code Values

Decimal Hexadecimal Character Control
000 00 Null NUL
001 01 images/UAB01.jpg SOH
002 02 STX
003 03 ETX
004 04 EOT
005 05 ENQ
006 06 ACK
007 07 BEL (audible bell)
008 08 -- Backspace
009 09 -- HT
010 0A -- LF (linefeed)
011 0B -- VT (vertical tab)
012 0C -- FF (form feed)
013 0D -- CR (carriage return)
014 0E -- SO
015 0F -- SI
016 10 -- DLE
017 11 -- DC1
018 12 -- DC2
019 13 -- DC3
020 14 -- DC4
021 15 -- NAK
022 16 -- SYN
023 17 -- ETB
024 18 -- CAN
025 19 -- EM
026 1A images/UAB02.jpg SUB
027 1B images/UAB03.jpg ESC (escape)
028 1C images/UAB04.jpg FS
029 1D -- GS
030 1E -- RS
031 1F -- US
032 20 -- Space
033 21 ! --
034 22 " --
035 23 # --
036 24 $ --
037 25 % --
038 26 & --
039 27 ' --
040 28 ( --
041 29 ) --
042 2A * --
043 2B + --
044 2C ' --
045 2D - --
046 2E . --
047 2F / --
048 30 0 --
049 31 1 --
050 32 2 --
051 33 3 --
052 34 4 --
053 35 5 --
054 36 6 --
055 37 7 --
056 38 8 --
057 39 9 --
058 3A : --
059 3B ; --
060 3C < --
061 3D = --
062 3E > --
063 3F ? --
064 40 @ --
065 41 A --
066 42 B --
067 43 C --
068 44 D --
069 45 E --
070 46 F --
071 47 G --
072 48 H --
073 49 I --
074 4A J --
075 4B K --
076 4C L --
077 4D M --
078 4E N --
079 4F O --
080 50 P --
081 51 Q --
082 52 R --
083 53 S --
084 54 T --
085 55 U --
086 56 V --
087 57 W --
088 58 X --
089 59 Y --
090 5A Z --
091 5B [ --
092 5C --
093 5D ] --
094 5E ^ --
095 5F _ --
096 60 ' --
097 61 a --
098 62 b --
099 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 | --
125 7D } --
126 7E ˜ --
127 7F Delete --

Note that the null character in the table is not necessarily the same as NULL, which is defined in the C library and whose value is implementation-dependent.

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