问题N 阶乘求和(Java代码)

解题思路:

注意事项:

参考代码:

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int n = sc.nextInt();

long temp = 1L;

long sum = 0L;

for(int j=1;j<=n;j++)

{

temp *= j;

sum += temp;

}

System.out.print(sum);

}

}