Problem 42410. Divisible by 8

Created by goc3

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Pursuant to the first problem in this series, this one involves checking for divisibility by 8.

Write a function to determine if a number is divisible by 8. This can be done by the following method:

Check the last three digits for divisibility by eight. If that portion of the number is divisible by eight, then so is the original number. That three-digit number can be further reduced by summing four times the hundreds digit, two times the tens digit, and the ones digit. As with methods for other numbers, this factor/sum step can be applied recursively until a single-digit number results.

Previous problem: divisible by 7. Next problem: divisible by 9.

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Last Solution submitted on Feb 18, 2020

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Solution 1281160

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3 Comments

Richard Blair on 4 Oct 2017

I don't why this does not pass, case 10 fails, even though this number is not divisible by 8 despite the case saying it does. Furthermore, I pass case 16 which has case 10 referenced but fail case 15 with the same case 10.

Any suggestions please!

James on 4 Oct 2017

Look *very* carefully at your definition of eightTable, and look at the last three digits of case 10.

Richard Blair on 6 Oct 2017

Thank James, obvious now that you said it :)

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Problem 42410. Divisible by 8

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Problem 42410. Divisible by 8

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