题解 | #挑7#
挑7
http://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
注意将数据转成字符串判断是否含7
同时再判断是否能被7整除，对应计数即可。
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(sc.hasNext()){
int n = sc.nextInt();
String str = "";
int count = 0;
//i = 0开始0也会算，就多了一个
for(int i = 1; i <= n; i++){
str = String.valueOf(i);
if(str.contains("7") || i % 7 == 0){
count++;
}
}
System.out.println(count);
}
sc.close();
}
} 
