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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
This is an old comment, but just in case someone else is puzzled reading it... The % operator in C and C-based languages like C++, Java and C#, is not a true "modulo operator". It's a remainder from integer division that truncates toward 0, so that nonzero values of x % y will have the same sign as x.
Many other languages use a remainder from floor division, where nonzero values of x % y have the same sign as y. So n%10 always gives the least positive remainder from dividing n / 10. In this case, that makes:
This problem is one of the rare cases (in my experience) where C-style remainders simplify code. Usually there's no difference, but when there is I find that I have to adjust for the difference more often in C than in Python or Ruby.
oh, that is weird let me know if you figure why that is
What are you talking about? I just tested with 0 and it passes just fine.