ASCII码表
信息在计算机上是用二进制表示的，这种表示法让人理解就很困难。因此计算机上都配有输入和输出设备，这些设备的主要目的就是，以一种人类可阅读的形式将信息在这些设备上显示出来供人阅读理解。为保证人类和设备，设备和计算机之间能进行正确的信息交换，人们编制的统一的信息交换代码，这就是ASCII码表，它的全称是“美国信息交换标准代码”。
| 八进制 | 十六进制 | 十进制 | 字符 | 八进制 | 十六进制 | 十进制 | 字符 | |
|---|---|---|---|---|---|---|---|---|
| 00 | 00 | 0 | nul | 100 | 40 | 64 | @ | |
| 01 | 01 | 1 | soh | 101 | 41 | 65 | A | |
| 02 | 02 | 2 | stx | 102 | 42 | 66 | B | |
| 03 | 03 | 3 | etx | 103 | 43 | 67 | C | |
| 04 | 04 | 4 | eot | 104 | 44 | 68 | D | |
| 05 | 05 | 5 | enq | 105 | 45 | 69 | E | |
| 06 | 06 | 6 | ack | 106 | 46 | 70 | F | |
| 07 | 07 | 7 | bel | 107 | 47 | 71 | G | |
| 10 | 08 | 8 | bs | 110 | 48 | 72 | H | |
| 11 | 09 | 9 | ht | 111 | 49 | 73 | I | |
| 12 | 0a | 10 | nl | 112 | 4a | 74 | J | |
| 13 | 0b | 11 | vt | 113 | 4b | 75 | K | |
| 14 | 0c | 12 | ff | 114 | 4c | 76 | L | |
| 15 | 0d | 13 | cr | 115 | 4d | 77 | M | |
| 16 | 0e | 14 | so | 116 | 4e | 78 | N | |
| 17 | 0f | 15 | si | 117 | 4f | 79 | O | |
| 20 | 10 | 16 | dle | 120 | 50 | 80 | P | |
| 21 | 11 | 17 | dc1 | 121 | 51 | 81 | Q | |
| 22 | 12 | 18 | dc2 | 122 | 52 | 82 | R | |
| 23 | 13 | 19 | dc3 | 123 | 53 | 83 | S | |
| 24 | 14 | 20 | dc4 | 124 | 54 | 84 | T | |
| 25 | 15 | 21 | nak | 125 | 55 | 85 | U | |
| 26 | 16 | 22 | syn | 126 | 56 | 86 | V | |
| 27 | 17 | 23 | etb | 127 | 57 | 87 | W | |
| 30 | 18 | 24 | can | 130 | 58 | 88 | X | |
| 31 | 19 | 25 | em | 131 | 59 | 89 | Y | |
| 32 | 1a | 26 | sub | 132 | 5a | 90 | Z | |
| 33 | 1b | 27 | esc | 133 | 5b | 91 | [ | |
| 34 | 1c | 28 | fs | 134 | 5c | 92 | \ | |
| 35 | 1d | 29 | gs | 135 | 5d | 93 | ] | |
| 36 | 1e | 30 | re | 136 | 5e | 94 | ^ | |
| 37 | 1f | 31 | us | 137 | 5f | 95 | _ | |
| 40 | 20 | 32 | sp | 140 | 60 | 96 | ' | |
| 41 | 21 | 33 | ! | 141 | 61 | 97 | a | |
| 42 | 22 | 34 | " | 142 | 62 | 98 | b | |
| 43 | 23 | 35 | # | 143 | 63 | 99 | c | |
| 44 | 24 | 36 | $ | 144 | 64 | 100 | d | |
| 45 | 25 | 37 | % | 145 | 65 | 101 | e | |
| 46 | 26 | 38 | & | 146 | 66 | 102 | f | |
| 47 | 27 | 39 | ` | 147 | 67 | 103 | g | |
| 50 | 28 | 40 | ( | 150 | 68 | 104 | h | |
| 51 | 29 | 41 | ) | 151 | 69 | 105 | i | |
| 52 | 2a | 42 | * | 152 | 6a | 106 | j | |
| 53 | 2b | 43 | + | 153 | 6b | 107 | k | |
| 54 | 2c | 44 | , | 154 | 6c | 108 | l | |
| 55 | 2d | 45 | - | 155 | 6d | 109 | m | |
| 56 | 2e | 46 | . | 156 | 6e | 110 | n | |
| 57 | 2f | 47 | / | 157 | 6f | 111 | o | |
| 60 | 30 | 48 | 0 | 160 | 70 | 112 | p | |
| 61 | 31 | 49 | 1 | 161 | 71 | 113 | q | |
| 62 | 32 | 50 | 2 | 162 | 72 | 114 | r | |
| 63 | 33 | 51 | 3 | 163 | 73 | 115 | s | |
| 64 | 34 | 52 | 4 | 164 | 74 | 116 | t | |
| 65 | 35 | 53 | 5 | 165 | 75 | 117 | u | |
| 66 | 36 | 54 | 6 | 166 | 76 | 118 | v | |
| 67 | 37 | 55 | 7 | 167 | 77 | 119 | w | |
| 70 | 38 | 56 | 8 | 170 | 78 | 120 | x | |
| 71 | 39 | 57 | 9 | 171 | 79 | 121 | y | |
| 72 | 3a | 58 | : | 172 | 7a | 122 | z | |
| 73 | 3b | 59 | ; | 173 | 7b | 123 | { | |
| 74 | 3c | 60 | < | 174 | 7c | 124 | 这是大分割线 | |
| 75 | 3d | 61 | = | 175 | 7d | 125 | } | |
| 76 | 3e | 62 | > | 176 | 7e | 126 | ~ | |
| 77 | 3f | 63 | ? | 177 | 7f | 127 | del |
