[masterzora]

> Was he new at this?

I mentioned he was a student for a reason. What do you think? This was a project for a class and even still he immediately recognised the error when he tested it.

Similar to as I mentioned in reply to a child comment, you kind of sound like someone chastising a physicist for dropping a negative somewhere in their calculations. It doesn't betray a fundamental lack of understanding such that they should be lectured to go back to first grade and learn how to do arithmetic; it just demonstrates that at some point they were acting somewhat careless in what they were doing.

And, yes, it is a bit of an embarrassing mistake. That's what makes it such a fun story!