ASCII 字符集完整對照表（十進制/八進制/十六進制/二進制/字符/名稱）

編輯：關於C語言

ASCII 字符集完整對照表

ASCII（American Standard Code for Information Interchange）定義了 128 個字符（0~127），包含控制字符（0~31, 127）和可打印字符（32~126）。下表列出所有碼位的多進制表示與官方名稱。

Dec	Oct	Hex	Bin	Char	Name
0	000	00	00000000	^@	NUL (Null)
1	001	01	00000001	^A	SOH (Start of Heading)
2	002	02	00000010	^B	STX (Start of Text)
3	003	03	00000011	^C	ETX (End of Text)
4	004	04	00000100	^D	EOT (End of Transmission)
5	005	05	00000101	^E	ENQ (Enquiry)
6	006	06	00000110	^F	ACK (Acknowledge)
7	007	07	00000111	^G	BEL (Bell)
8	010	08	00001000	^H	BS (Backspace)
9	011	09	00001001	^I	HT (Horizontal Tab)
10	012	0A	00001010	^J	LF (Line Feed)
11	013	0B	00001011	^K	VT (Vertical Tab)
12	014	0C	00001100	^L	FF (Form Feed)
13	015	0D	00001101	^M	CR (Carriage Return)
14	016	0E	00001110	^N	SO (Shift Out)
15	017	0F	00001111	^O	SI (Shift In)
16	020	10	00010000	^P	DLE (Data Link Escape)
17	021	11	00010001	^Q	DC1 (Device Control 1, XON)
18	022	12	00010010	^R	DC2 (Device Control 2)
19	023	13	00010011	^S	DC3 (Device Control 3, XOFF)
20	024	14	00010100	^T	DC4 (Device Control 4)
21	025	15	00010101	^U	NAK (Negative Acknowledge)
22	026	16	00010110	^V	SYN (Synchronous Idle)
23	027	17	00010111	^W	ETB (End of Transmission Block)
24	030	18	00011000	^X	CAN (Cancel)
25	031	19	00011001	^Y	EM (End of Medium)
26	032	1A	00011010	^Z	SUB (Substitute)
27	033	1B	00011011	^[	ESC (Escape)
28	034	1C	00011100	^\	FS (File Separator)
29	035	1D	00011101	^]	GS (Group Separator)
30	036	1E	00011110	^^	RS (Record Separator)
31	037	1F	00011111	^_	US (Unit Separator)
32	040	20	00100000		SP (Space)
33	041	21	00100001	!	Exclamation Mark
34	042	22	00100010	"	Quotation Mark
35	043	23	00100011	#	Number Sign
36	044	24	00100100	$	Dollar Sign
37	045	25	00100101	%	Percent Sign
38	046	26	00100110	&	Ampersand
39	047	27	00100111	'	Apostrophe
40	050	28	00101000	(	Left Parenthesis
41	051	29	00101001	)	Right Parenthesis
42	052	2A	00101010	*	Asterisk
43	053	2B	00101011	+	Plus Sign
44	054	2C	00101100	,	Comma
45	055	2D	00101101	-	Hyphen-Minus
46	056	2E	00101110	.	Full Stop
47	057	2F	00101111	/	Solidus
48	060	30	00110000	0	Digit Zero
49	061	31	00110001	1	Digit One
50	062	32	00110010	2	Digit Two
51	063	33	00110011	3	Digit Three
52	064	34	00110100	4	Digit Four
53	065	35	00110101	5	Digit Five
54	066	36	00110110	6	Digit Six
55	067	37	00110111	7	Digit Seven
56	070	38	00111000	8	Digit Eight
57	071	39	00111001	9	Digit Nine
58	072	3A	00111010	:	Colon
59	073	3B	00111011	;	Semicolon
60	074	3C	00111100	<	Less-Than Sign
61	075	3D	00111101	=	Equals Sign
62	076	3E	00111110	>	Greater-Than Sign
63	077	3F	00111111	?	Question Mark
64	100	40	01000000	@	Commercial At
65	101	41	01000001	A	Latin Capital Letter A
66	102	42	01000010	B	Latin Capital Letter B
67	103	43	01000011	C	Latin Capital Letter C
68	104	44	01000100	D	Latin Capital Letter D
69	105	45	01000101	E	Latin Capital Letter E
70	106	46	01000110	F	Latin Capital Letter F
71	107	47	01000111	G	Latin Capital Letter G
72	110	48	01001000	H	Latin Capital Letter H
73	111	49	01001001	I	Latin Capital Letter I
74	112	4A	01001010	J	Latin Capital Letter J
75	113	4B	01001011	K	Latin Capital Letter K
76	114	4C	01001100	L	Latin Capital Letter L
77	115	4D	01001101	M	Latin Capital Letter M
78	116	4E	01001110	N	Latin Capital Letter N
79	117	4F	01001111	O	Latin Capital Letter O
80	120	50	01010000	P	Latin Capital Letter P
81	121	51	01010001	Q	Latin Capital Letter Q
82	122	52	01010010	R	Latin Capital Letter R
83	123	53	01010011	S	Latin Capital Letter S
84	124	54	01010100	T	Latin Capital Letter T
85	125	55	01010101	U	Latin Capital Letter U
86	126	56	01010110	V	Latin Capital Letter V
87	127	57	01010111	W	Latin Capital Letter W
88	130	58	01011000	X	Latin Capital Letter X
89	131	59	01011001	Y	Latin Capital Letter Y
90	132	5A	01011010	Z	Latin Capital Letter Z
91	133	5B	01011011	[	Left Square Bracket
92	134	5C	01011100	\	Reverse Solidus
93	135	5D	01011101	]	Right Square Bracket
94	136	5E	01011110	^	Circumflex Accent
95	137	5F	01011111	_	Low Line
96	140	60	01100000	`	Grave Accent
97	141	61	01100001	a	Latin Small Letter A
98	142	62	01100010	b	Latin Small Letter B
99	143	63	01100011	c	Latin Small Letter C
100	144	64	01100100	d	Latin Small Letter D
101	145	65	01100101	e	Latin Small Letter E
102	146	66	01100110	f	Latin Small Letter F
103	147	67	01100111	g	Latin Small Letter G
104	150	68	01101000	h	Latin Small Letter H
105	151	69	01101001	i	Latin Small Letter I
106	152	6A	01101010	j	Latin Small Letter J
107	153	6B	01101011	k	Latin Small Letter K
108	154	6C	01101100	l	Latin Small Letter L
109	155	6D	01101101	m	Latin Small Letter M
110	156	6E	01101110	n	Latin Small Letter N
111	157	6F	01101111	o	Latin Small Letter O
112	160	70	01110000	p	Latin Small Letter P
113	161	71	01110001	q	Latin Small Letter Q
114	162	72	01110010	r	Latin Small Letter R
115	163	73	01110011	s	Latin Small Letter S
116	164	74	01110100	t	Latin Small Letter T
117	165	75	01110101	u	Latin Small Letter U
118	166	76	01110110	v	Latin Small Letter V
119	167	77	01110111	w	Latin Small Letter W
120	170	78	01111000	x	Latin Small Letter X
121	171	79	01111001	y	Latin Small Letter Y
122	172	7A	01111010	z	Latin Small Letter Z
123	173	7B	01111011	{	Left Curly Bracket
124	174	7C	01111100	\|	Vertical Line
125	175	7D	01111101	}	Right Curly Bracket
126	176	7E	01111110	~	Tilde
127	177	7F	01111111	DEL	DEL (Delete/Rubout)

常用控制字符速查

Dec	Char	名稱	常見用途
0	NUL	空字符	C 字符串結束符
7	BEL	響鈴	終端發聲
8	BS	退格	光標左移
9	HT	水平製表	\t 對齊
10	LF	換行	Unix 換行 \n
13	CR	回車	Mac 經典/Win \r\n 一部分
27	ESC	逃逸	ANSI 轉義序列開頭
127	DEL	刪除	終端刪除字符

C 語言中使用

char c = 65;        // 'A'
char c = '\x41';    // 十六進制
char c = '\101';    // 八進制
char newline = '\n'; // LF (10)
char tab = '\t';     // HT (9)
char esc = '\x1b';   // ESC (27)
printf("ASCII of 'A': %d\n", 'A'); // 65