double保留4位小数【点击查看详情】
import java.text.NumberFormat; import java.util.Scanner;public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println('请输入一串数字,通过空格分开,负数作为结束：'); double n = sc.nextDouble(); while (n >= 0) { NumberFormat nf = NumberFormat.getInstance(); nf.setMinimumFractionDigits(4); System.out.println(n + '的平方根是：' + nf.forma
