题解 | #求平均数#

import java.util.Scanner;

public class Main {

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

    //write your code here......
    double sum = 0;
    int value = 0;
    int count = 0;
    double avg = 0;
    while(value>=0) {
    	value = scanner.nextInt();
    	if(value < 0) {
    		break;
    	}
    	++count;
    	sum = sum + value;
    	avg = (double)(sum/count);
    }
    System.out.printf("%.2f",avg);

    //输出格式为：System.out.println(String.format("%.2f",avg));
    

}

}