captcha

Scanner tara = new Scanner(System.in);
        Random rnd = new Random();

        System.out.println("Doğruma Kodu Kaç Karakter olsun");
        int kac = tara.nextInt();
        System.out.print("DOĞRULAMA KODU:");
        int rakam = (int) (Math.random() * 9) + 48;
            int buyuk = (int) (Math.random() * 25) + 65;
            int kucuk = (int) (Math.random() * 25) + 97;
        String mehmet= (char) rakam + "" + (char) buyuk + "" + (char) kucuk;
          for (int c = 0; c < kac / 3; c++) {

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