题解 | #求平均数#

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = 0;
        double avg = 0;
        //write your code here......
        int count = 0;
        while((a = sc.nextInt()) > 0){
            avg = avg + a;
            count++;
        }
        avg = avg / count;
        System.out.println(String.format("%.2f",avg));
        //输出格式为：System.out.println(String.format("%.2f",avg));
        

    }
}