Java从键盘读取若干个实数，以-1结束

日期：2020/1/14

功能：从键盘读取若干个实数，以-1结束

IDE：Intellij IDEA

package testDemo;

import java.util.Scanner;

public class ReadKey {
    public static void main(String[] args){
        double sum=0;
        int count=0;
        Scanner scanner = new Scanner(System.in);
        double key = scanner.nextDouble();
        while(key!=-1){
            sum+=key;
            count++;
            key = scanner.nextDouble();
        }
        System.out.println("平均数："+sum/count);
    }
}