练习题 | 与7无关的数

 1 public class NumberSeven {
 2 
 3     public static void main(String[] args) {
 4         // TODO 自动生成的方法存根
 5        //与7无关的数
 6        Scanner scan=new Scanner(System.in);
 7        int n=scan.nextInt();
 8        scan.close();//按要求输入数据
 9        
10        int sum=0;
11        for(int number=1;number<=n;number++){
12            if(number%7!=0&&donotHasSeven(number)){
13                sum=sum+number*number;
14            }
15        }
16        
17        System.out.print(sum);
18     }
19     
20     static boolean donotHasSeven(int number){
21         while(number>0){
22             if(number%10==7)return false;
23             number=number/10;
24         }
25         return true;
26     }
27 
28 }