I agree that there are a lot of experienced programmers who don't know what gamma function is; it's well beyond somebody who didn't even think to write a factorial function. This is a comment that is intended for all the people who come after thinking that the naive factorial implementations are the only way to go. — duffymo 23 secs ago

Even if what would be the best? questions are hard to answer your question would be better placed on programmers.stackexchange.com — Alex B. 58 secs ago

@WhozCraig It is also worth remembering, just in case, that things we commonly believe about names are all wrong. — n.m. 24 secs ago

I'm voting to close this question as off-topic because it belongs perhaps on programmers.stackexchange.com — user151841 1 min ago

you should use more { and } to increase readability and maintainability, because .... — martijnn2008 31 secs ago

I think it's the OS that hide things in it, not programmers. Or only apple software engineers. — Adrien Brunelat 22 secs ago

Note that I didn't downvote you. If you want people to know you've tried or researched something, then you need to post what you did. A common phrase here is, "This is not a code writing service." Show you've done your homework, show us where you're stuck, and people will be glad to help. But we're not here to be friends and you're not paying us so don't expect people to stroke your ego. People will come across as short, nit-picky, and ungraceful. We're programmers, not diplomats. — Bacon Bits 59 secs ago