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:
DEC(十进制) | HEX(十六进制) | CHAR(字符) | CODE(控制码) | C 程序(转义) |
0 | 00 (零零) | NUL | ('\0') | |
1 | 01 | SOH | ||
2 | 02 | STX | ||
3 | 03 | ETX | ||
4 | 04 | EOT | ||
5 | 05 | ENQ | ||
6 | 06 | ACK | ||
7 | 07 | BEL | ('\a') | |
8 | 08 | BS | ('\b') | |
9 | 09 | HT | ('\t') | |
10 | 0A | LF | ('\n') | |
11 | 0B | VT | ('\v') | |
12 | 0C | FF | ('\f') | |
13 | 0D | CR | ('\r') | |
14 | 0E | SO | ||
15 | 0F | SI | ||
16 | 10 | DLE | ||
17 | 11 | DC1 | ||
18 | 12 | DC2 | ||
19 | 13 | DC1 | ||
20 | 14 | DC4 | ||
21 | 15 | NAK | ||
22 | 16 | SYN | ||
23 | 17 | ETB | ||
24 | 18 | CAN | ||
25 | 19 | EM | ||
26 | 1A | SUB | ||
27 | 1B | ESC | ||
28 | 1C | FS | ||
29 | 1D | GS | ||
30 | 1E | RS | ||
31 | 1F | US | ||
32 | 20 | (space,空格) | ||
33 | 21 | ! | ||
34 | 22 | " | ||
35 | 23 | # | ||
36 | 24 | $ | ||
37 | 25 | % | ||
38 | 26 | & | ||
39 | 27 | ' | ||
40 | 28 | ( | ||
41 | 29 | ) | ||
42 | 2A | * | ||
43 | 2B | + | ||
44 | 2C | , | ||
45 | 2D | - | ||
46 | 2E | . | ||
47 | 2F | / | ||
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 | : | ||
59 | 3B | ; | ||
60 | 3C | < | ||
61 | 3D | = | ||
62 | 3E | > | ||
63 | 3F | ? | ||
64 | 40 | @ | ||
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 | ('\\') | ||
93 | 5D | ] | ||
94 | 5E | ^ | ||
95 | 5F | _ | ||
96 | 60 | ` | ||
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 | | | ||
125 | 7D | } | ||
126 | 7E | ~ | ||
127 | 7F | DEL |
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