# FAQ: Virtual Computer - What You'll Be Building

This community-built FAQ covers the “What You’ll Be Building” exercise from the lesson “Virtual Computer”.

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## FAQs on the exercise What You’ll Be Building

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In the output I see a bug:
The users are given by username and password. The password of the first person is not correct. It is 668 instead of 01234. I am curious what is causing this.

Good eye.

4 * 80 + 3 * 81 + 2 * 82 + 1 * 83 = 668

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Why and how does this happen? Is it because of the zero at the start of the number?

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Yes! The 0 denotes octal.

You can read more from the Ruby Documentation (`https://docs.ruby-lang.org/en/2.5.0/syntax/literals_rdoc.html`)

For decimal numbers use a prefix of `0d` , for hexadecimal numbers use a prefix of `0x` , for octal numbers use a prefix of `0` or `0o` , for binary numbers use a prefix of `0b` .

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