Denary <-> Octal

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An octal number in the range 00000 to 77777
corresponds to a denary number in the range 0 to 32767.

We can convert the number in either direction.
There is a choice of ways to do it. Use the one you like.

Octal to Denary		Sum of place values
		Chain calculation
Denary to Octal		Sum of place values
		Chain calculation