java经典算法_020求1+2!+3!+...+20!的和

package wzs.arithmetics;//题目：求1+2!+3!+...+20!的和 public class Test_wzs20{    public static void main(String[] args)    {        long temp = 1;        long sum = 0;        for (int i = 1; i <= 20; i++)        {            temp = temp * i;            sum += temp;        }        System.out.println("sum=" + sum);    }}

输出结果：

sum=2561327494111820313