C语言训练-求1+2!+3!+...+N!的和 （Java代码）循环递归都行，注意变量类型的范围

注意int的范围

参考代码:

import java.util.Scanner;

public class Main1133 {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int x = sc.nextInt();

long result = 0;

for (int i = 1; i <= x; i++) {

result += factorial1(i);

}

System.out.println(result);

}

// for循环计算阶乘

public static long factorial1(int i) {

long y = 1;

for (int j = 1; j <= i; j++) {

y *= j;

}

return y;

}

// 递归计算阶乘，供参考，未调用

public static long factorial(int i) {

if (i == 1) {

return 1;

}

return i * factorial(i - 1);

}

}