Different outputs by integer in Rails' console

Question

I can't figure it out why, when I type 67 in Rails' console, the output is 67, but 067 returns 55.

Can someone explain this to me?

Community · Accepted Answer · 2017-05-23 12:33:08Z

1

Starting a number with a 0 denotes that the number is in octal notation.

When you type in 067, you're really saying "67 in octal notation" or "67₈ (67 base 8)". When Ruby outputs that number it converts it to decimal (base 10).

Since 67₈ == 55₁₀, Ruby outputs 55.

Check out "How do I convert an octal number to decimal in Ruby?" that mentions the leading 0.

See "Octal to decimal converter" for an octal calculator:

edited May 23, 2017 at 12:33

CommunityBot

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answered Aug 25, 2016 at 18:17

Sergey

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