1385. 幸运数字8

8是小九的幸运数字，小九想知道在1~n的数中有多少个数字含有8。

样例

Example1

Input:  n = 20
Output: 2
Explanation:
Only 8,18 contains 8.

Example2

Input:  n = 100
Output: 19
Explanation:
8,18,28,38,48,58,68,78,80,81,82,83,84,85,86,87,88,89,98 contains 8.

注意事项

• 1 <= n <= 1000000

输入测试数据 (每行一个参数)

public class Solution {
    /**
     * @param n: count lucky numbers from 1 ~ n
     * @return: the numbers of lucky number
     */
    public int luckyNumber(int n) {
        // Write your code here
        int count = 0;
        for(int i = 0; i <= n; i++){
            int k = i;
            while(k!=0){
                if(k%10 == 8){
                    count++;
                    break;
                }else{
                    k /= 10;
                }
            }
        }
        return count;
    }
}