题解 | 求平均数

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

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

        //输出格式为：System.out.println(String.format("%.2f",avg));
        int count = 0;
        int sum = 0;
        int temp = 0;
        while((temp = scan.nextInt()) >= 0){
            sum += temp;
            count++;
        }

        double avg = (sum * 1.0) / (count * 1.0);

        System.out.println(String.format("%.2f",avg));
    }
}