Your friends are people you know well and like spending time with. You can refer to a friend who you know very well as a good friend or a close friend. He's a good friend of mine. A close friend told me about it. If someone has been your friend for a long time, you can refer to them as an old friend. He or she is not necessarily an old person.
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4 Along with TrevorD, I'm in the UK. I've seen w/o for without and w/ for with, but not b/c. They are not suitable for formal use. It's potentially of interest that the Pitman shorthand symbol for w resembles w/ and is often used on its own to mean with.
Normally one would just say without problem, skipping the any altogether. It doesn’t really add anything to speak of, and just makes the phrase longer. But I certainly wouldn’t call without any problems (or with no problems) ‘wrong’. Also, you can swap in trouble for problem in all those phrases, and you get the same answer; think also of no trouble found.
I was watching a speech on TV by someone who said the sentence "..and our country faces threats from within [long pause] and without." I thought this was wrong and jokingly posted about on social ...
The meaning of FRIEND is one attached to another by affection or esteem —sometimes used ironically or humorously to refer to a person who is disliked or annoying.