用Java编写以下程序，求助求助

Question

编写程序计算1！+2！+3！+...+n！，并输出计算结果。（要求：n从键盘输入，0<=n<=50，如果输入的n值不在此范围，提示再次输入）

Answer 1

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/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static double p(int x)
    {
        double r = 1.0;
        for (int i = 2; i <= x; i++) r *= i;
        return r;
    }
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        Scanner s = new Scanner(System.in);
        int n = s.nextInt();
        if (n > 50 || n < 0)
        {
            System.out.println("不在范围！");
        }
        else
        {
            double d = 0;
            for (int i = 1; i <= n; i++)
                d += p(i);
            System.out.println("结果=" + d);
        }
    }
}

输入4
输出结果=33.0
在线验证
https://ideone.com/ylntIF