Description
ASCII is the standard code for information exchange in the United States. It is a 7-bit code. Many 8-bit codes (such as ISO 8859-1, Linux’s default character set) accommodate ASCII as The lower part of them. The corresponding international ASSII is ISO 646.
The following table contains these 128 ASCII characters.
Attention C program '\X' extension (escaping).
| Oct Dec Hex Char Oct Dec Hex Char | ||||||||
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| 000 0 00 NUL’\0′ 100 64 40 @ | < /td> | |||||||
| 001 1 01 SOH 101 65 41 A | ||||||||
| 002 2 02 STX 102 66 42 B | ||||||||
| 003 3 03 ETX 103 67 43 C | < /td> | |||||||
| 004 4 04 EOT 104 68 44 D | < /td> | |||||||
| 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 | ||||||||
| < /td> | ||||||||
| 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 | < /td> | |||||||
| 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 | < /td> | |||||||
| 031 25 19 EM 131 89 59 Y | ||||||||
| 032 26 1A SUB 132 90 5A Z | ||||||||
| 033 27 1B ESC 133 91 5B [ | < /td> | |||||||
| 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 | < /td> | |||||||
| 044 36 24 $ 144 100 64 d | ||||||||
| 045 37 25% 145 101 65 e | < /td> | |||||||
| 046 38 26 & 146 102 66 f | ||||||||
| 047 39 27 ‘147 103 67 g | ||||||||
| 050 40 28 (150 104 68 h< /td> | ||||||||
| 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 | < /td> | |||||||
| 060 48 30 0 160 112 70 p | ||||||||
| 061 49 31 1 161 113 71 q | < /td> | |||||||
| 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 | < /td> | 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
A ascii man page appeared in version 7 of AT&T UNIX.
On some old terminals, the accent (underline) is displayed with a left arrow, called backarrow, the caret is displayed as an up arrow and the vertical line has a hole in the middle.
The difference between uppercase and lowercase characters is only one digit, and the ASCII character 2 is different from double quotation marks, which is also one digit. This makes it easier to encode characters, either mechanically (keyboard) or a non-microcontroller-based electronic keyboard, both of which can be matched on old teletypewriters.
The ASCII standard was published by the American Standards Institute (USASI) in 1968.