HOW TO BECOME PROFICIENT IN C

So I claimed I was proficient in a number of languages on my resume, all of which I've barely used.

I think I can get away with some of it but I really think I need to know how to use C and Python well for the job. He said the job might require C# which is close enough to core C.

How do I become proficient with these languages in a week or so?

>>39
[quote]Undefined behavior. Ie, there some are systems where you won't see the output until *after* the program exits.[/quote]
Just use fflush(3) or setvbuf(3) if you're seriously worried about this.

>>49
[quote]I also don't know how to fix the scanf problem.[/quote]
scanf(3) returns the number of tokens which have been successfully scanned.  If this number doesn't match the number of tokens in your format string, you know have a problem.

Just read the man pages, it's all in there.