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);

        //write your code here......
        

        //输出格式为：System.out.println(String.format("%.2f",avg));
        int sum = 0;
        int num = sc.nextInt(),i=0;
        while (num>0){
            i++;
            sum = sum + num;
            //System.out.println(sum);
            num = sc.nextInt();
        }
        //System.out.println(i);
        //"%.2f%n",
        double avg = (double) sum /i;
        System.out.printf("%.2f%n", avg);

    }
}