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Octal




<mathematics> Base 8.

A number representation using the digits 0-7 only, with the right-most digit counting ones, the next counting multiples of 8, then 8^2 = 64, etc.

For example, octal 177 is digital 127:

digit



weight







value 1



8^2 = 64

1* 64 = 64 7



8^1 =

8

7*

8 = 56 7



8^0 =

1

7*

1 =

7 --- 127

Octal system used to be widespread back when many computers used 6-bit bytes, as a 6-bit byte can be conveniently written as a two-digit octal number.

Since nowadays a byte is almost always 8-bit long the octal system lost most of its appeal to the hexadecimal system.

For a brief discussion on the word `octal' see hexadecimal.



< Previous Terms Terms Containing octal Next Terms >
OC-n
OCODE
OCP
OCR
OCS
ASCII character table
bucky bits
dot notation
dump
fossil
octal forty
Octave
octet
octothorpe
OCX


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