How to Convert ASCII to Octal

Converting ASCII to octal is a common task in computer programming. ASCII is a character encoding standard that assigns a unique number to each character. Octal, on the other hand, is a base-8 number system that uses eight digits, 0 through 7. Converting ASCII to octal involves converting each character to its corresponding octal value.

Conversion

Here's a step-by-step guide on how to convert ASCII to octal:

1. Choose the ASCII character you want to convert to octal.
2. Convert the ASCII character to its decimal value using an ASCII table.
3. Convert the decimal value to octal using the division-by-8 method.
4. Pad the octal value with leading zeros to make it 3 digits long (if necessary).

Example

Let's walk through an example to illustrate the process. Suppose we want to convert the ASCII character 'A' to octal.

1. The ASCII value of 'A' is 65.
2. To convert 65 to octal, we use the division-by-8 method. We divide 65 by 8 and get a quotient of 8 with a remainder of 1. We write down the remainder (1) as the least significant digit of the octal value. We then divide 8 by 8 and get a quotient of 1 with a remainder of 0. We write down the remainder (0) as the next digit of the octal value. We continue this process until we have 3 digits. The octal value of 65 is 101.
3. Since the octal value we obtained in step 2 is only 3 digits long, we don't need to pad it with leading zeros.

Quotient	Remainder	Octal
$65/8=8$	1	1
$8/8=1$	0	01
$1/8=0$	1	101

ASCII-Octal Table

Here's a table that shows the ASCII values of all characters and their corresponding octal values:

Character	Description	Decimal	Octal
0	Zero	48	60
1	One	49	61
2	Two	50	62
3	Three	51	63
4	Four	52	64
5	Five	53	65
6	Six	54	66
7	Seven	55	67
8	Eight	56	70
9	Nine	57	71
A	Capital A	65	101
B	Capital B	66	102
C	Capital C	67	103
D	Capital D	68	104
E	Capital E	69	105
F	Capital F	70	106
G	Capital G	71	107
H	Capital H	72	110
I	Capital I	73	111
J	Capital J	74	112
K	Capital K	75	113
L	Capital L	76	114
M	Capital M	77	115
N	Capital N	78	116
O	Capital O	79	117
P	Capital P	80	120
Q	Capital Q	81	121
R	Capital R	82	122
S	Capital S	83	123
T	Capital T	84	124
U	Capital U	85	125
V	Capital V	86	126
W	Capital W	87	127
X	Capital X	88	130
Y	Capital Y	89	131
Z	Capital Z	90	132
a	Small a	97	141
b	Small b	98	142
c	Small c	99	143
d	Small d	100	144
e	Small e	101	145
f	Small f	102	146
g	Small g	103	147
h	Small h	104	150
i	Small i	105	151
j	Small j	106	152
k	Small k	107	153
l	Small l	108	154
m	Small m	109	155
n	Small n	110	156
o	Small o	111	157
p	Small p	112	160
q	Small q	113	161
r	Small r	114	162
s	Small s	115	163
t	Small t	116	164
u	Small u	117	165
v	Small v	118	166
w	Small w	119	167
x	Small x	120	170
y	Small y	121	171
z	Small z	122	172

See full ascii table here.

Sample Code

This code requires @ilihub/code npm package to run.

import { AsciiToOctal } from "@ilihub/code";

const ascii = "Hello World";

const octal = AsciiToOctal(ascii);
console.log(octal);

// Output
// 110145154154157040127157162154144

References

• ASCII Number
• Decimal Number
• Octal Number

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