题解 | 求平均数

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long sum  =0;
        double count = 0;
        while(sc.hasNextInt()){
            int x  = sc.nextInt();
            if(x<0){
                break;
            }
            sum  = sum + x;
            count++;
        }
        double avg = sum/count;
        System.out.println(String.format("%.2f",avg));

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

    }
}

我觉得要把count的类型设为double这样会省很多力气