package jhash;

public class Hash {

    public static int getHash(String s, int lenght) {
        int usedLenght = lenght + 1;
        double tmp = 0;
        for (int i = 0; i < s.length(); ++i) {
            char c = s.charAt(i);
            int j = (int) c;
            tmp += j;
        }

        tmp = Math.abs(Integer.reverse((int)tmp));

        while (tmp < Math.pow(10, usedLenght - 1) || tmp > Math.pow(10, usedLenght)) {
            if (tmp >= Math.pow(10, usedLenght)) {
                int zbytek = (int)(tmp % 2);
                tmp = ((tmp / 2) + zbytek) - (zbytek / 2);
            }
            if (tmp < Math.pow(10, usedLenght - 1)) {
                tmp = tmp * 2;
            }
        }
        
        return (int) (tmp / 10.0);
    }
}