分类:
2008-07-06 17:01:25
第0~32号及第127号(共34个)是控制字符或通讯专用字符,如控制符:LF(换行)、CR(回车)、FF(换页)、DEL(删除)、BEL(振铃)等;通讯专用字符:SOH(文头)、EOT(文尾)、ACK(确认)等;
第33~126号(共94个)是字符,其中第48~57号为0~9十个阿拉伯数字;65~90号为26个大写英文字母,97~122号为26个小写英文字母,其余为一些标点符号、运算符号等。
注意:在计算机的存储单元中,一个ASCII码值占一个字节(8个二进制位),其最高位(b7)用作奇偶校验位。所谓奇偶校验,是指在代码传送过程中用来检验是否出现错误的一种方法,一般分奇校验和偶校验两种。奇校验规定:正确的代码一个字节中1的个数必须是奇数,若非奇数,则在最高位b7添1;偶校验规定:正确的代码一个字节中1的个数必须是偶数,若非偶数,则在最高位b7添1。
为了便于查询,以下列出ASCII码表:
第128~255号为扩展字符(不常用)
Dec | Hx | Oct | Char | Dec | Hx | Oct | Char | Dec | Hx | Oct | Char | Dec | Hx | Oct | Char | |
0 | 0 | 000 | NUL | (null) | 32 | 20 | 040 | SPACE | 64 | 40 | 100 | @ | 96 | 60 | 140 | ` |
1 | 1 | 001 | SOH | (start of heading) | 33 | 21 | 041 | ! | 65 | 41 | 101 | A | 97 | 61 | 141 | a |
2 | 2 | 002 | STX | (start of text) | 34 | 22 | 042 | " | 66 | 42 | 102 | B | 98 | 62 | 142 | b |
3 | 3 | 003 | ETX | (end of text) | 35 | 23 | 043 | # | 67 | 43 | 103 | C | 99 | 63 | 143 | c |
4 | 4 | 004 | EOT | (end of transmission) | 36 | 24 | 044 | $ | 68 | 44 | 104 | D | 100 | 64 | 144 | d |
5 | 5 | 005 | ENQ | (enquiry) | 37 | 25 | 045 | % | 69 | 45 | 105 | E | 101 | 65 | 145 | e |
6 | 6 | 006 | ACK | (acknowledge) | 38 | 26 | 046 | & | 70 | 46 | 106 | F | 102 | 66 | 146 | f |
7 | 7 | 007 | BEL | (bell) | 39 | 27 | 047 | ' | 71 | 47 | 107 | G | 103 | 67 | 147 | g |
8 | 8 | 010 | BS | (backspace) | 40 | 28 | 050 | ( | 72 | 48 | 110 | H | 104 | 68 | 150 | h |
9 | 9 | 011 | TAB | (horizontal tab) | 41 | 29 | 051 | ) | 73 | 49 | 111 | I | 105 | 69 | 151 | i |
10 | A | 012 | LF | (NL line feed, new_line) | 42 | 2A | 052 | * | 74 | 4A | 112 | J | 106 | 6A | 152 | j |
11 | B | 013 | VT | (vertical tab) | 43 | 2B | 053 | + | 75 | 4B | 113 | K | 107 | 6B | 153 | k |
12 | C | 014 | FF | (NP form feed, new page) | 44 | 2C | 054 | , | 76 | 4C | 114 | L | 108 | 6C | 154 | l |
13 | D | 015 | CR | (carriage return) | 45 | 2D | 055 | - | 77 | 4D | 115 | M | 109 | 6D | 155 | m |
14 | E | 016 | SO | (shift out) | 46 | 2E | 056 | . | 78 | 4E | 116 | N | 110 | 6E | 156 | n |
15 | F | 017 | SI | (shift in) | 47 | 2F | 057 | / | 79 | 4F | 117 | O | 111 | 6F | 157 | o |
16 | 10 | 020 | DLE | (data link escape) | 48 | 30 | 060 | 0 | 80 | 50 | 120 | P | 112 | 70 | 160 | p |
17 | 11 | 021 | DC1 | (device control 1) | 49 | 31 | 061 | 1 | 81 | 51 | 121 | Q | 113 | 71 | 161 | q |
18 | 12 | 022 | DC2 | (device control 2) | 50 | 32 | 062 | 2 | 82 | 52 | 122 | R | 114 | 72 | 162 | r |
19 | 13 | 023 | DC3 | (device control 3) | 51 | 33 | 063 | 3 | 83 | 53 | 123 | S | 115 | 73 | 163 | s |
20 | 14 | 024 | DC4 | (device control 4) | 52 | 34 | 064 | 4 | 84 | 54 | 124 | T | 116 | 74 | 164 | t |
21 | 15 | 025 | NAK | (negative acknowledge) | 53 | 35 | 065 | 5 | 85 | 55 | 125 | U | 117 | 75 | 165 | u |
22 | 16 | 026 | SYN | (synchronous idle) | 54 | 36 | 066 | 6 | 86 | 56 | 126 | V | 118 | 76 | 166 | v |
23 | 17 | 027 | ETB | (end of trans. block) | 55 | 37 | 067 | 7 | 87 | 57 | 127 | W | 119 | 77 | 167 | w |
24 | 18 | 030 | CAN | (cancel) | 56 | 38 | 070 | 8 | 88 | 58 | 130 | X | 120 | 78 | 170 | x |
25 | 19 | 031 | EM | (end of medium) | 57 | 39 | 071 | 9 | 89 | 59 | 131 | Y | 121 | 79 | 171 | y |
26 | 1A | 032 | SUB | (substitute) | 58 | 3A | 072 | : | 90 | 5A | 132 | Z | 122 | 7A | 172 | z |
27 | 1B | 033 | ESC | (escape) | 59 | 3B | 073 | ; | 91 | 5B | 133 | [ | 123 | 7B | 173 | { |
28 | 1C | 034 | FS | (file separator) | 60 | 3C | 074 | < | 92 | 5C | 134 | \ | 124 | 7C | 174 | |
29 | 1D | 035 | GS | (group separator) | 61 | 3D | 075 | = | 93 | 5D | 135 | ] | 125 | 7D | 175 | } |
30 | 1E | 036 | RS | (record separator) | 62 | 3E | 076 | > | 94 | 5E | 136 | ^ | 126 | 7E | 176 | ~ |
31 | 1F | 037 | US | (unit separator) | 63 | 3F | 077 | ? | 95 | 5F | 137 | _ | 127 | 7F | 177 | DEL |
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