201912-1报数

题目：

代码：

import java.util.Scanner;

public class CountOff {

    public static int[] countoff(int n){
        int[] count = new int[5];
        boolean include7=false;
        String n2s;
        char[] s2c;
        
        for (int k = 0; k < count.length; k++) {
            count[k]=0;
        }

 
        for(int i=1;i<=n;i++){
            include7 = false;      
            n2s = String.valueOf(i);        
            s2c = n2s.toCharArray();          
            for (int t = 0; t < s2c.length; t++) {
                if (s2c[t] == '7') {
                    include7 = true;
                    break;
                }
            }           
            if (i%7 == 0 || include7) {
                n+=1;
              
                int j=i%4;
                if (j == 0) {
                    count[4]++;
                } else {
                    count[j]++;
                }

            }
        }
        return count;
    }

    public static void main(String[] args) {

        int n;
        int[] a = new int[5];
        Scanner scan = new Scanner(System.in);

        n = scan.nextInt();
        a = countoff(n);

        for(int i=1;i<=4;i++){
            System.out.println(a[i]);
        }

    }
}

主类名称改为Main

int 转 string String.valueOf()
string 转 char[] str.toCharArray()