Octal Number System

In this number system,

Octal means '8'

Base (or) Radix of octal number system is '8'.

Therefore, r = 8.

Number of digits in this number system are 0, 1, 2, 3, 4, 5, 6, 7.

Highest value is '7'.

Therefore, r-1 = 7.

Octal number system can be represented by octal position values as power of 8.

For example,

(65.47)8 = 6*8power1 + 5*8power0 . 4*8power(-1) + 7*8power(-2)