I can't see the characters I want to display

import UIKit

classViewController:UIViewController {
    @IBOutlet varuranau: UIButton!
    @ IBAction func Uranau (sender: UIButton) {
    }

    @ IBAction funcuranau (sender: UIButton) {
        varkekka=""
        varkazu=arc4 random_uniform(5)
        switch kazu {
        case4:
            kekka = "Okichi"
        case3:
            kekka="Nakayoshi"
        case2:
            kekka = "Kokichi"
        case1:
            kekka = "Good luck"
        case0:
            kekka = "Bad"
        default:
            kekka = "Error"

        }
        print(kekka)
    }