public static String convert100(int num){
		String str = "";
		if(num >= 100){
			str += digits[num /100 -1] + " Hundred ";
			num %= 100;
		}
		
		if(num >= 11 && num <= 19){
			return str + teens[num - 11] + " ";
		}else if(num == 10 || num >= 20){
			str += tens[num /10 -1] + " ";
			num %= 10;
		}
		
		if(num >= 1 && num <= 9){
			str += digits[num -1] + "";
		}
		return str;
	}