while倒数阶乘的和

package zuoye;

public class zuoyetest 
{

    public static void main(String[] args) 
{
         int c=20;
         double d=1;
         double sum=0;
         double e=1;
         
         while (true)
         {
             if (d<=c)
             {
                 e=e*d;
                 e=1/e;
                 d++;
                 sum=sum+e;
                 continue;
                 
             }
             System.out.println("阶乘的和="+sum);
             if (d>c)
             {
                 break;
             }
         }
    }

}