private String decToBin(int d) {
		String bin = "";
		
		int rest;
		int div;
		
		rest = d % 2;
		div = d / 2;
		
		if(div != 0) {
			bin = bin + decToBin(div);
		}
		
		bin = bin + String.valueOf(rest);
		return bin;
		
	}