ASC II complete code table and introduction
At present, the most widely used character set and its encoding are used in the computer, which is the AMERICAN Standard Code for Information Interchange, the US Standard Information Exchange Code, which has been International Standardization (ISO) ) Is set as an international standard, called ISO 646 standard. Suitable for all Latin letters, ASCII code has 7-digit code and 8-bit code. Because the 1-bit binary number can be represented (21 =) 2 states: 0, 1; 2-bit binary number can be represented (22) = 4 states: 00, 01, 10, 11; secondary push, 7-bit binary number Indicates (27 =) 128 states, each state uniquely compiled a 7-bit binary code, corresponding to a character (or control code), which can be arranged into a decimal number 0 to 127. Therefore, the 7-bit ASCII code is encoded with seven-bit binary, and 128 characters can be represented.第 0 to 32 and 127 (34) are control characters or communication-specific characters, such as controls: LF (wrap), CR (Enter), FF (change page), Del (delete), BS Randide, Bel (ring), etc .; communication special characters: SOH (Wen head), EOT (Tuna), ACK (confirmation), etc .; No. 33-126 (94) is a character, of which 48 ~ 57 is 0 ~ 9 ten arabic numbers; 65 ~ 90 is 26 uppercase English letters, 97 ~ 122 is 26 lowercase English letters, the rest is some punctuation, operation symbols, etc. Note: In the memory cell of the computer, an ASCII code value accounts for one byte (8 binary bits), and its highest position (B7) is used as a parity bit. The so-called parity refers to a method for verifying whether there is an error in the code transfer process, generally derived by two types. Odd-calibration: The correct code 1 by one byte must be an odd number, if not odd, then add 1 in the highest bit B7; Even Value Specification: The correct code 1 number 1 must be an even number If non-even numbers, add 1 at the highest bit B7.
The first 128 post-expansion 0 00 € NUL1 01 € SOH2 02 € Stx3 03 € ETX4 04 € eot5 05 € ENQ6 06 € ACK7 07 € Bel8 08 € BS9 09 € HT10 0A € LF11 0B € VT12 0C € FF13 0D € CR14 0E € SO15 0F € Si16 10 € SLE17 11 € CS118 12 € DC219 13 € DC320 14 € DC421 15 € NAK22 16 € SYN23 17 € ETB24 18 € CAN25 19 € EM26 1A € SIB27 1B € ESC 28 1C € FS29 1D € GS30 1E RS31 1F € US32 20 (SPACE) 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 33 3 52 32 2 53 35 55 34 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 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 55 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`
