DaWei

First, get a decent editor, or if you're using one, set your preferences so that tabs are converted to spaces. Your formatting sucks, even after I added code tags for you.

Secondly, I don't know why you're using a generic "isDivisibleBy" function, when your ealier stated requirement was divisible by 5, and divisible by 2. The mod operator would be much more efficient. That's okay, though. What isn't okay is nesting one function inside another. If you're going to use it, put it outside main.

Once you fix that and clean things up a bit, we'll have another look. Incidentally, are you reading your error messages? Just curious.

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Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

The Dark

You only increment i if the number is divisible by 5. Since 1 isn't evenly divisible by 5 your loop never gets off 1.