1！+2！+……+N！

[java]代码库

import java.util.Scanner;
public class Main 
{
	public static void main(String[] args) 
	   {   
		   Scanner x = new Scanner(System.in);//构造一个SCANNER对象，其传入参数为SYSTEM.IN
    	   int n = x.nextInt();//读取一个INT数值
    	   int sum = 0;
	       for ( int i = 1; i <= n; i++)
	       {
	    	   int tmp = 1;
	    	   for (int j = 1; j <= i; j++)
	        	   tmp *= j;
	    	   sum += tmp;
	       }
	       System.out.println(sum);
	   }
}