ASCII（American Standard Code for Information Interchange，美国信息互换标准代码）是基于拉丁字母的一套电脑编码系统。它主要用于显示现代英语和其他西欧语言。它是现今最通用的单字节编码系统，并等同于国际标准ISO/IEC 646。 ASCII第一次以规范标准的型态发表是在1967年，最后一次更新则是在1986年，至今为止共定义了128个字符，其中33个字符无法显示（这是以现今操作系统为依归，但在DOS模式下可显示出一些诸如笑脸、扑克牌花式等8-bit符号），且这33个字符多数都已是陈废的控制字符，控制字符的用途主要是用来操控已经处理过的文字，在33个字符之外的是95个可显示的字符，包含用键盘敲下空白键所产生的空白字符也算1个可显示字符（显示为空白）。 控制字符 +----------+------+--------+----+----------------+-------------------------+ | 二进制 |十进制|十六进制|缩写| 表示法 | 名称/意义 | +----------+------+--------+----+----------------+-------------------------+ |0000 0000 | 0 | 00 |NUL | NUL |空字符(Null) | +----------+------+--------+----+----------------+-------------------------+ |0000 0001 | 1 | 01 |SOH | SOH |标题开始 | +----------+------+--------+----+----------------+-------------------------+ |0000 0010 | 2 | 02 |STX | STX |本文开始 | +----------+------+--------+----+----------------+-------------------------+ |0000 0011 | 3 | 03 |ETX | ETX |本文结束 | |----------+------+--------+----+----------------+-------------------------+ |0000 0100 | 4 | 04 |EOT | EOT |传输结束 | +----------+------+--------+----+----------------+-------------------------+ |0000 0101 | 5 | 05 |ENQ | ENQ |请求 | +----------+------+--------+----+----------------+-------------------------+ |0000 0110 | 6 | 06 |ACK | ACK |确认回应 | +----------+------+--------+----+----------------+-------------------------+ |0000 0111 | 7 | 07 |BEL | BEL |响铃 | +----------+------+--------+----+----------------+-------------------------+ |0000 1000 | 8 | 08 | BS | BS |退格 | +----------+------+--------+----+----------------+-------------------------+ |0000 1001 | 9 | 09 | HT | HT |水平定位符号 | +----------+------+--------+----+----------------+-------------------------+ |0000 1010 | 10 | 0A | LF | LF |换行键 | +----------+------+--------+----+----------------+-------------------------+ |0000 1011 | 11 | 0B | VT | VT |垂直定位符号 | +----------+------+--------+----+----------------+-------------------------+ |0000 1100 | 12 | 0C | FF | FF |换页键 | +----------+------+--------+----+----------------+-------------------------+ |0000 1101 | 13 | 0D | CR | CR |归位键 | +----------+------+--------+----+----------------+-------------------------+ |0000 1110 | 14 | 0E | SO | SO |取消变换(Shif | +----------+------+--------+----+----------------+-------------------------+ |0000 1111 | 15 | 0F | SI | SI |启用变换(Shif | +----------+------+--------+----+----------------+-------------------------+ |0001 0000 | 16 | 10 |DLE | DLE |跳出数据通讯 | +----------+------+--------+----+----------------+-------------------------+ |0001 0001 | 17 | 11 |DC1 | DC1 |设备控制一（X制） | +----------+------+--------+----+----------------+-------------------------+ |0001 0010 | 18 | 12 |DC2 | DC2 |设备控制二 | +----------+------+--------+----+----------------+-------------------------+ |0001 0011 | 19 | 13 |DC3 | DC3 |设备控制三（X控制） | +----------+------+--------+----+----------------+-------------------------+ |0001 0100 | 20 | 14 |DC4 | DC4 |设备控制四 | +----------+------+--------+----+----------------+-------------------------+ |0001 0101 | 21 | 15 |NAK | NAK |确认失败回应 | +----------+------+--------+----+----------------+-------------------------+ |0001 0110 | 22 | 16 |SYN | SYN |同步用暂停 | +----------+------+--------+----+----------------+-------------------------+ |0001 0111 | 23 | 17 |ETB | ETB |区块传输结束 | +----------+------+--------+----+----------------+-------------------------+ |0001 1000 | 24 | 18 |CAN | CAN |取消 | +----------+------+--------+----+----------------+-------------------------+ |0001 1001 | 25 | 29 | EM | EM |连接介质中断 | +----------+------+--------+----+----------------+-------------------------+ |0001 1010 | 26 | 1A |SUB | SUB |替换 | +----------+------+--------+----+----------------+-------------------------+ |0001 1011 | 27 | 1B |ESC | ESC |跳出 | +----------+------+--------+----+----------------+-------------------------+ |0001 1100 | 28 | 1C | FS | FS |文件分割符 | +----------+------+--------+----+----------------+-------------------------+ |0001 1101 | 29 | 1D | GS | GS |组群分隔符 | +----------+------+--------+----+----------------+-------------------------+ |0001 1110 | 30 | 1E | RS | RS |记录分隔符 | +----------+------+--------+----+----------------+-------------------------+ |0001 1111 | 31 | 1F | US | US |单元分隔符 | +----------+------+--------+----+----------------+-------------------------+ |0111 1111 | 127 | 7F |DEL | DEL |删除 | +----------+------+--------+----+----------------+-------------------------+ 可显示字符 +----------+------+--------+----------+ | 二进制 |十进制|十六进制| 图形 | +----------+------+--------+----------+ |0010 0000 | 32 | 20 | 空格(sp) | +----------+------+--------+----------+ |0010 0001 | 33 | 21 | ! | +----------+------+--------+----------+ |0010 0010 | 34 | 22 | " | +----------+------+--------+----------+ |0010 0011 | 35 | 23 | # | +----------+------+--------+----------+ |0010 0100 | 36 | 24 | $ | +----------+------+--------+----------+ |0010 0101 | 37 | 25 | % | +----------+------+--------+----------+ |0010 0110 | 38 | 26 | & | +----------+------+--------+----------+ |0010 0111 | 39 | 27 | ' | +----------+------+--------+----------+ |0010 1000 | 40 | 28 | ( | +----------+------+--------+----------+ |0010 1001 | 41 | 29 | ) | +----------+------+--------+----------+ |0010 1010 | 42 | 2A | * | +----------+------+--------+----------+ |0010 1011 | 43 | 2B | + | +----------+------+--------+----------+ |0010 1100 | 44 | 2C | , | +----------+------+--------+----------+ |0010 1101 | 45 | 2D | - | +----------+------+--------+----------+ |0010 1110 | 46 | 2E | . | +----------+------+--------+----------+ |0010 1111 | 47 | 2F | / | +----------+------+--------+----------+ |0011 0000 | 48 | 30 | 0 | +----------+------+--------+----------+ |0011 0001 | 49 | 31 | 1 | +----------+------+--------+----------+ |0011 0010 | 50 | 32 | 2 | +----------+------+--------+----------+ |0011 0011 | 51 | 33 | 3 | +----------+------+--------+----------+ |0011 0100 | 52 | 34 | 4 | +----------+------+--------+----------+ |0011 0101 | 53 | 35 | 5 | +----------+------+--------+----------+ |0011 0110 | 54 | 36 | 6 | +----------+------+--------+----------+ |0011 0111 | 55 | 37 | 7 | +----------+------+--------+----------+ |0011 1000 | 56 | 38 | 8 | +----------+------+--------+----------+ |0011 1001 | 57 | 39 | 9 | +----------+------+--------+----------+ |0011 1010 | 58 | 3A | : | +----------+------+--------+----------+ |0011 1011 | 59 | 3B | ; | +----------+------+--------+----------+ |0011 1100 | 60 | 3C | < | +----------+------+--------+----------+ |0011 1101 | 61 | 3D | = | +----------+------+--------+----------+ |0011 1110 | 62 | 3E | > | +----------+------+--------+----------+ |0011 1111 | 63 | 3F | ? | +----------+------+-------------------+ +----------+------+---------+---------+ | 二进制 |十进制|十六进制 | 图形 | +----------+------+---------+---------+ |0100 0000 | 64 | 40 | @ | +----------+------+---------+---------+ |0100 0001 | 65 | 41 | A | +----------+------+---------+---------+ |0100 0010 | 66 | 42 | B | +----------+------+---------+---------+ |0100 0011 | 67 | 43 | C | +----------+------+---------+---------+ |0100 0100 | 68 | 44 | D | +----------+------+---------+---------+ |0100 0101 | 69 | 45 | E | +----------+------+---------+---------+ |0100 0110 | 70 | 46 | F | +----------+------+---------+---------+ |0100 0111 | 71 | 47 | G | +----------+------+---------+---------+ |0100 1000 | 72 | 48 | H | +----------+------+---------+---------+ |0100 1001 | 73 | 49 | I | +----------+------+---------+---------+ |0100 1010 | 74 | 4A | J | +----------+------+---------+---------+ |0100 1011 | 75 | 4B | K | +----------+------+---------+---------+ |0100 1100 | 76 | 4C | L | +----------+------+---------+---------+ |0100 1101 | 77 | 4D | M | +----------+------+---------+---------+ |0100 1110 | 78 | 4E | N | +----------+------+---------+---------+ |0100 1111 | 79 | 4F | O | +----------+------+---------+---------+ |0101 0000 | 80 | 50 | P | +----------+------+---------+---------+ |0101 0001 | 81 | 51 | Q | +----------+------+---------+---------+ |0101 0010 | 82 | 52 | R | +----------+------+---------+---------+ |0101 0011 | 83 | 53 | S | +----------+------+---------+---------+ |0101 0100 | 84 | 54 | T | +----------+------+---------+---------+ |0101 0101 | 85 | 55 | U | +----------+------+---------+---------+ |0101 0110 | 86 | 56 | V | +----------+------+---------+---------+ |0101 0111 | 87 | 57 | W | +----------+------+---------+---------+ |0101 1000 | 88 | 58 | X | +----------+------+---------+---------+ |0101 1001 | 89 | 59 | Y | +----------+------+---------+---------+ |0101 1010 | 90 | 5A | Z | +----------+------+---------+---------+ |0101 1011 | 91 | 5B | [ | +----------+------+---------+---------+ |0101 1100 | 92 | 5C | \ | +----------+------+---------+---------+ |0101 1101 | 93 | 5D | ] | +----------+------+---------+---------+ |0101 1110 | 94 | 5E | ^ | +----------+------+---------+---------+ |0101 1111 | 95 | 5F | _ | +----------+------+---------+---------+ +----------+------+---------+---------+ | 二进制 |十进制|十六进制 | 图形 | +----------+------+---------+---------+ |0110 0000 | 96 | 60 | ` | +----------+------+---------+---------+ |0110 0001 | 97 | 61 | a | +----------+------+---------+---------+ |0110 0010 | 98 | 62 | b | +----------+------+---------+---------+ |0110 0011 | 99 | 63 | c | +----------+------+---------+---------+ |0110 0100 | 100 | 64 | d | +----------+------+---------+---------+ |0110 0101 | 101 | 65 | e | +----------+------+---------+---------+ |0110 0110 | 102 | 66 | f | +----------+------+---------+---------+ |0110 0111 | 103 | 67 | g | +----------+------+---------+---------+ |0110 1000 | 104 | 68 | h | +----------+------+---------+---------+ |0110 1001 | 105 | 69 | i | +----------+------+---------+---------+ |0110 1010 | 106 | 6A | j | +----------+------+---------+---------+ |0110 1011 | 107 | 6B | k | +----------+------+---------+---------+ |0110 1100 | 108 | 6C | l | +----------+------+---------+---------+ |0110 1101 | 109 | 6D | m | +----------+------+---------+---------+ |0110 1110 | 110 | 6E | n | +----------+------+---------+---------+ |0110 1111 | 111 | 6F | o | +----------+------+---------+---------+ |0111 0000 | 112 | 70 | p | +----------+------+---------+---------+ |0111 0001 | 113 | 71 | q | +----------+------+---------+---------+ |0111 0010 | 114 | 72 | r | +----------+------+---------+---------+ |0111 0011 | 115 | 73 | s | +----------+------+---------+---------+ |0111 0100 | 116 | 74 | t | +----------+------+---------+---------+ |0111 0101 | 117 | 75 | u | +----------+------+---------+---------+ |0111 0110 | 118 | 76 | v | +----------+------+---------+---------+ |0111 0111 | 119 | 77 | w | +----------+------+---------+---------+ |0111 1000 | 120 | 78 | x | +----------+------+---------+---------+ |0111 1001 | 121 | 79 | y | +----------+------+---------+---------+ |0111 1010 | 122 | 7A | z | +----------+------+---------+---------+ |0111 1011 | 123 | 7B | { | +----------+------+---------+---------+ |0111 1100 | 124 | 7C | | | +----------+------+---------+---------+ |0111 1101 | 125 | 7D | } | +----------+------+---------+---------+ |0111 1110 | 126 | 7E | ~ | +----------+------+---------+---------+ vim:set wrap ff=dos: