题解 | #求平均数#

public class test {
                public static void main(String[] args) {
                     Scanner scan = new Scanner(System.in);
                     int x=scan.nextInt();
                     int sum=0,count=0;
                        while(x>=0) {
                            sum+=x;
                            count++;
                            x=scan.nextInt();
                        }
                       double avg=(double)sum/count;
                        System.out.println(String.format("%.2f",avg));
                }
}