Appendix E. THE ASCII CHARACTER SET

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Appendix E. THE ASCII CHARACTER SET

Computers store characters by using a numeric code. The ASCII code (American Standard Code for Information Interchange) is the most commonly used code in the United States. C lets you represent most single characters directly, by including the character in single quotation marks, as in 'A' for the A character. You can also represent a single character by using the octal or hex code preceded by a backslash; for example, '\012' and '\0xa' both represent the linefeed (LF) character. Such escape sequences can also be part of a string, as in "Hello,\012my dear" .

When used as a prefix in the following table, the ^ character denotes using the Ctrl key.

Decimal	Octal	Hex	Binary	Character	ASCII Name
			00000000	^@	NUL
1	01	0x1	00000001	^A	SOH
2	02	0x2	00000010	^B	STX
3	03	0x3	00000011	^C	ETX
4	04	0x4	00000100	^D	EOT
5	05	0x5	00000101	^E	ENQ
6	06	0x6	00000110	^F	ACK
7	07	0x7	00000111	^G	BEL
8	010	0x8	00001000	^H	BS
9	011	0x9	00001001	^I, tab	HT
10	012	0xa	00001010	^J	LF
11	013	0xb	00001011	^K	VT
12	014	0xc	00001100	^L	FF
13	015	0xd	00001101	^M	CR
14	016	0xe	00001110	^N	SO
15	017	0xf	00001111	^O	SI
16	020	0x10	00010000	^P	DLE
17	021	0x11	00010001	^Q	DC1
18	022	0x12	00010010	^R	DC2
19	023	0x13	00010011	^S	DC3
20	024	0x14	00010100	^T	DC4
21	025	0x15	00010101	^U	NAK
22	026	0x16	00010110	^V	SYN
23	027	0x17	00010111	^W	ETB
24	030	0x18	00011000	^X	CAN
25	031	0x19	00011001	^Y	EM
26	032	0x1a	00011010	^Z	SUB
27	033	0x1b	00011011	^[, esc	ESC
28	034	0x1c	00011100	^\	FS
29	035	0x1d	00011101	^]	GS
30	036	0x1e	00011110	^^	RS
31	037	0x1f	00011111	^_	US
32	040	0x20	00100000	space	SP
33	041	0x21	00100001	!
34	042	0x22	00100010	"
35	043	0x23	00100011	#
36	044	0x24	00100100	$
37	045	0x25	00100101	%
38	046	0x26	00100110	&
39	047	0x27	00100111	'
40	050	0x28	00101000	(
41	051	0x29	00101001	)
42	052	0x2a	00101010	*
43	053	0x2b	00101011	+
44	054	0x2c	00101100	'
45	055	0x2d	00101101	-
46	056	0x2e	00101110	.
47	057	0x2f	00101111	/
48	060	0x30	00110000
49	061	0x31	00110001	1
50	062	0x32	00110010	2
51	063	0x33	00110011	3
52	064	0x34	00110100	4
53	065	0x35	00110101	5
54	066	0x36	00110110	6
55	067	0x37	00110111	7
56	070	0x38	00111000	8
57	071	0x39	00111001	9
58	072	0x3a	00111010	:
59	073	0x3b	00111011	;
60	074	0x3c	00111100	<
61	075	0x3d	00111101	=
62	076	0x3e	00111110	>
63	077	0x3f	00111111	?
64	0100	0x40	01000000	@
65	0101	0x41	01000001	A
66	0102	0x42	01000010	B
67	0103	0x43	01000011	C
68	0104	0x44	01000100	D
69	0105	0x45	01000101	E
70	0106	0x46	01000110	F
71	0107	0x47	01000111	G
72	0110	0x48	01001000	H
73	0111	0x49	01001001	I
74	0112	0x4a	01001010	J
75	0113	0x4b	01001011	K
76	0114	0x4c	01001100	L
77	0115	0x4d	01001101	M
78	0116	0x4e	01001110	N
79	0117	0x4f	01001111	O
80	0120	0x50	01010000	P
81	0121	0x51	01010001	Q
82	0122	0x52	01010010	R
83	0123	0x53	01010011	S
84	0124	0x54	01010100	T
85	0125	0x55	01010101	U
86	0126	0x56	01010110	V
87	0127	0x57	01010111	W
88	0130	0x58	01011000	X
89	0131	0x59	01011001	Y
90	0132	0x5a	01011010	Z
91	0133	0x5b	01011011	[
92	0134	0x5c	01011100	\
93	0135	0x5d	01011101	]
94	0136	0x5e	01011110	^
95	0137	0x5f	01011111	_
96	0140	0x60	01100000	'
97	0141	0x61	01100001	a
98	0142	0x62	01100010	b
99	0143	0x63	01100011	c
100	0144	0x64	01100100	d
101	0145	0x65	01100101	e
102	0146	0x66	01100110	f
103	0147	0x67	01100111	g
104	0150	0x68	01101000	h
105	0151	0x69	01101001	i
106	0152	0x6a	01101010	j
107	0153	0x6b	01101011	k
108	0154	0x6c	01101100	l
109	0155	0x6d	01101101	m
110	0156	0x6e	01101110	n
111	0157	0x6f	01101111	o
112	0160	0x70	01110000	p
113	0161	0x71	01110001	q
114	0162	0x72	01110010	r
115	0163	0x73	01110011	s
116	0164	0x74	01110100	t
117	0165	0x75	01110101	u
118	0166	0x76	01110110	v
119	0167	0x77	01110111	w
120	0170	0x78	01111000	x
121	0171	0x79	01111001	y
122	0172	0x7a	01111010	z
123	0173	0x7b	01111011	{
124	0174	0x7c	01111100
125	0175	0x7d	01111101	}
126	0176	0x7e	01111110	~
127	0177	0x7f	01111111	del, rubout

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