Introduction to C Programming - Character Codes

Chapter chap1 section 9

Here is a list of ASCII character codes in octal and hexadecimal notation along with the equivalent C escape sequence where relevant. This table is not comprehensive.

Octal code	Hexadecimal code	Escape Sequence	Control Sequence	Standard Designation	Function
000	00	-	Ctrl-@	Null	does nothing
001	01	-	Ctrl-A	SOH	-
002	02	-	Ctrl-B	STX	-
003	03	-	Ctrl-C	ETX	Sometimes Break Program
004	04	-	Ctrl-D	EOT	Sometimes End of File
005	05	-	Ctrl-E	ENQ	-
006	06	-	Ctrl-F	ACK	-
007	07	\a	Ctrl-G	BEL	Audible Signal
010	08	\b	Ctrl-H	BS	Backspace
011	09	\t	Ctrl-I	HT	TAB
012	0a	\n	Ctrl-J	NL	Newline or Linefeed
013	0b	\v	Ctrl-K	VT	Vertical TAB
014	0c	\f	Ctrl-L	FF	New Page or Clear Screen
015	0d	\r	Ctrl-M	CR	Carriage Return
016	0e	-	Ctrl-N	SO	-
017	0f	-	Ctrl-O	SI	-
020	10	-	Ctrl-P	DLE	-
021	11	-	Ctrl-Q	DC1	Flow Control - On
022	12	-	Ctrl-R	DC2	-
023	13	-	Ctrl-S	DC3	Flow Control - Off
024	14	-	Ctrl-T	DC4	-
025	15	-	Ctrl-U	NAK	Sometimes Line Delete
026	16	-	Ctrl-V	SYN	-
027	17	-	Ctrl-W	ETB	-
030	18	-	Ctrl-X	CAN	Sometimes Line Delete
031	19	-	Ctrl-Y	EM	-
032	1a	-	Ctrl-Z	SUB	Sometimes End of File
033	1b	-	Ctrl-[	ESC	Often Escape for Screen Control
034	1c	-	Ctrl-\	FS	-
035	1d	-	Ctrl-]	GS	-
036	1e	-	Ctrl-^	RS	-
037	1f	-	Ctrl-_	US	-
040	20	-	-	SP	Space - Hit the space bar

And the normal printing character codes with hexadecimal and octal equivalent values.

21 041 !  22 042 "  23 043 #  24 044 $  25 045 %  26 046 &  
27 047 '  28 050 (  29 051 )  2a 052 *  2b 053 +  2c 054 ,  
2d 055 -  2e 056 .  2f 057 /  30 060 0  31 061 1  32 062 2  
33 063 3  34 064 4  35 065 5  36 066 6  37 067 7  38 070 8  
39 071 9  3a 072 :  3b 073 ;  3c 074 <  3d 075 =  3e 076 >  
3f 077 ?  40 100 @  41 101 A  42 102 B  43 103 C  44 104 D  
45 105 E  46 106 F  47 107 G  48 110 H  49 111 I  4a 112 J  
4b 113 K  4c 114 L  4d 115 M  4e 116 N  4f 117 O  50 120 P  
51 121 Q  52 122 R  53 123 S  54 124 T  55 125 U  56 126 V  
57 127 W  58 130 X  59 131 Y  5a 132 Z  5b 133 [  5c 134 \  
5d 135 ]  5e 136 ^  5f 137 _  60 140 `  61 141 a  62 142 b  
63 143 c  64 144 d  65 145 e  66 146 f  67 147 g  68 150 h  
69 151 i  6a 152 j  6b 153 k  6c 154 l  6d 155 m  6e 156 n  
6f 157 o  70 160 p  71 161 q  72 162 r  73 163 s  74 164 t  
75 165 u  76 166 v  77 167 w  78 170 x  79 171 y  7a 172 z  
7b 173 {  7c 174 |  7d 175 }  7e 176 ~

Exercises