0-31 是打印控制32-47 标点1区(32是空格)48-57 数字49-64 标点2区
65-90 大写字母91-96 标点3区97-122 小写字母123-126 标点4区127是删除
大小写字母区别在二进制第5位为0是大写字母 为1是小写字母
数字区将二进制高四位置0
余下的二进制的值就是要表示的数字值
二进制后四位为0 被16整除(可扩展)二进制低端n位为0被2n整除二进制尾数为0或1判断奇偶无符号整数:左移1位乘2,右移除2
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）
DecHxOctChar DecHxOctCharDecHxOctCharDecHxOctChar00000NUL(null)3220040SPACE6440100@9660140`11001SOH(start of heading)3321041!6541101A9761141a22002STX(start of text)3422042"6642102B9862142b33003ETX(end of text)3523043#6743103C9963143c44004EOT(end of transmission)3624044$6844104D10064144d55005ENQ(enquiry)3725045i45105E10165145e66006ACK(acknowledge)3826046&7046106F10266146f77007BEL(bell)3927047'7147107G10367147g88010BS(backspace)4028050(7248110H10468150h99011TAB(horizontal tab)4129051)7349111I10569151i10A012LF(NL line feed, new_line)422A052*744A112J1066A152j11B013VT(vertical tab)432B053+754B113K1076B153k12C014FF(NP form feed, new page)442C054,764C114L1086C154l13D015CR(carriage return)452D055-774D115M1096D155m14E016SO(shift out)462E056.784E116N1106E156n15F017SI(shift in)472F057/794F117O1116F157o1610020DLE(data link escape)483006008050120P11270160p1711021DC1(device control 1)493106118151121Q11371161q1812022DC2(device control 2)503206228252122R11472162r1913023DC3(device control 3)513306338353123S11573163s2014024DC4(device control 4)523406448454124T11674164t2115025NAK(negative acknowledge)533506558555125U11775165u2216026SYN(synchronous idle)543606668656126V11876166v2317027ETB(end of trans. block)553706778757127W11977167w2418030CAN(cancel)563807088858130X12078170x2519031EM(end of medium)573907198959131Y12179171y261A032SUB(substitute)583A072:905A132Z1227A172z271B033ESC(escape)593B073;915B133[1237B173{281C034FS(file separator)603C074<925C134/1247C174 291D035GS(group separator)613D075=935D135]1257D175}301E036RS(record separator)623E076>945E136^1267E176~311F037US(unit separator)633F077?955F137_1277F177DEL 扩充字符集(Extended Character Set) ISO Latin-1字符集(编码160-255) 编码字符编码字符编码字符编码字符160 172¬184¸196Ä161¡173 185¹197Å162¢174®186º198Æ163£175÷187»199Ç164¤176 188¼200È165¥177±189½201É166¦178²190¾202Ê167”179³191¿203Ë168¨180´192À204Ì169©181µ193Á205Í170ª182¶194Â206Î171«183·195Ã207Ï 编码字符编码字符编码字符编码字符208Ð220Ü232è244ô209Ñ221Ý233é245õ210Ò222Þ234ê246ö211Ó223ß235ë247÷212Ô224à236ì248ø213Õ225á237í249ù214Ö226â238î250ú215⊙227ã239ï251û216Ø228ä240ð252ü217Ù229å241ñ253ý218Ú230æ242ò254þ219Û231ç243ó255ÿ
