Octal number system is base-8 system with 8 digits 0 to 7.
Example of a octal number: 147.2
Expanding numbers as a power series with base of 8.
Example of octal number:
(147.2)8 = 1x82 + 4x81 + 7x80 + 2x8-1 = 64 + 32 + 7 + 0.25 = (103.25)10
Octal number system tutorial.
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