【Java】计算1+1/2!+1/3!+1/4!....前20项

package com.company;
//计算1+1/2!+1/3!+1/4!....前20项

public class Main {
    public static void main(String arg[]) {
        double sum = 0, item = 1;
        int i = 1, n = 20;
        while (i <= n) {
            sum += item;
            i++;
            item = item * (1.0 / i);
        }
        System.out.println("sum=" + sum);
    }
}