Rosetta Code

I went over to the Rosetta Code website to look at the examples of Julia in action. Amongst them I found one marked as not completed so I took the challenge. This code picks the middle three digits from numbers returning an error message if it's not possible. It illustrates the use of the @sprintf macro for formatting text. You don't waste a lot of keystrokes when you write Julia:

	function middle(i)
	let s = string(abs(i)) , l = length(s) , mid = int((l+1)/2)
	l < 3 ?
	"error: not enough digits" :
	iseven(l) ?
	"error: number of digits is even" :
	join((s[mid-1],s[mid],s[mid+1]))
	end
	end
	for n = [123, 12345, 1234567, 987654321, 10001, -10001, -123,
	-100, 100, -12345, 1, 2, -1, -10, 2002, -2002, 0]
	println (@sprintf("%10d : ",n), middle(n))
	end

view raw gistfile1.jl hosted with ❤ by GitHub