HJ55 挑7

1. 题目

读题

HJ55 挑7 

 

考查点

 

2. 解法

思路

 

代码逻辑

 

具体实现

 

自行实现

 

public class HJ055 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println(getSevenRelCnt(sc.nextInt(), 7));
    }

    public static int getSevenRelCnt(int n, int target) {
        int cnt = 0;
        for (int i = 1; i <= n; i++) {
            if (i % target == 0 || contain(i, target)) {
                cnt++;
            }
        }
        return cnt;
    }

    public static boolean contain(int x, int target) {
        while (x > 0) {
            if (x % 10 == target) {
                return true;
            }
            x = x / 10;
        }
        return false;
    }
}

3. 总结