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;
    //注意连续要用的变量放循环外面
    while(true){
        
        int a=scan.nextInt();
        if(a>0){
            sum+=a;
            count++;
        }else{
            //注意强转一个(float)
           double avg=sum/(double)count;
            System.out.println(String.format("%.2f",avg));
            break;
        }
    }
    

// return -1; }

}