输入一个正整数n,求1/1!+1/2!+......+1/n!
代码:
1 import java.util.*;
2 public class Main {
3 public static void main (String [] args) {
4 Scanner s=new Scanner(System.in);
5 int n=s.nextInt();
6 double sum=0;
7 for(int i=1;i<=n;i++) {
8 int p=1;
9 for(int j=1;j<=i;j++) {
10 p*=j;
11 }
12 sum+=1.0/p;
13 }
14 System.out.println(sum);
15 }
16 }