8 求s=a+aa+aaa+aaaa+aa...a的值

 1       public class _008MoreAdd {
 2 
 3     public static void main(String[] args) {
 4         print();
 5     }
 6 
 7     private static void print() {
 8         long a = 0;
 9         while (true) {
10             Scanner sc = new Scanner(System.in);
11             System.out.println("请输入1~9之间的数:");
12             a = sc.nextInt();
13             System.out.println("请输入需要相加的次数:");
14             int n = sc.nextInt();
15             sum(a, n);
16         }
17     }
18 
19     private static void sum(long a, int n) {
20         long b = 0;
21         long sum = 0;
22         int i = 0;
23         while (i < n) {
24             b = b + a;
25             sum = sum + b;
26             a = a * 10;
27             ++i;
28         }
29         System.out.println("结果是"+sum);
30     }
31 }