Divide Two Integers

Divide two integers without using multiplication, division and mod operator.

public class Solution {
    public int divide(int dividend, int divisor) {
        if(dividend ==0 || divisor==1)
            return dividend;
        int sign =1;
        if(dividend<0)
            sign *=-1;
        if(divisor<0)
            sign*=-1;
        long res = 0;
        long div = Math.abs((long) dividend);// don't forget the abs!
        long dis = Math.abs((long) divisor);
        long [] b = new long[32];
        int start = 0;
        while(dis<=div && start<32){ // here don't forget <32
            b[start] = dis;
            dis = dis<<1;
            start++;
        }
        start--;
        while(div>0 && start>=0){ 
            if(div-b[start]>=0){ // just like this
                res += 1<<start;
                div-=b[start];
            }
            start--;
        }
        return (int) sign*(int)res;
    }
}