Swift If program

Still a beginner with just playing around with some basic functions in swift.

Can someone tell me what is wrong with this code?

import UIKit

var guessInt:Int
var randomNum = arc4random_uniform(10)


if Int(randomNum) == guessInt {


println ("correct")

}  else {


println; "no, the number is not. guess again"

}

So far the only error I'm getting is that

guessInt

is being used before being initialized! I've tried to type everything again but still have the same error.

Thanks in advance.