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);
        double sum =0.0;
        int count =0;
        while (true){
            int num = scan.nextInt();
            if (num <0){
                break;
            }else if (num >0 && num <= 10000){
                sum += num;
                count++;
            }
        }

        if(count >0 ){
            double av = sum / count;
            System.out.printf("%.2f", av);
        }
        //write your code here......
        scan.close();
        //输出格式为：System.out.println(String.format("%.2f",avg));
        
    }
}