public class Main { public static void main(String[] args) { //write your code here........ //注意int的取值范围是-2^31——2^31-1,也就是-2147483648——2147483647 long value = 0l; long j = 9l; for(int i = 0;i <= 9;i++){ value = j + value; j = j*10 + 9; } System.out.print(value); } }