求1+2!+3!+...+20!的和

分类: 文章 • 2024-09-06 14:04:58

package homework;

public class practice3 {

   public static void main(String[] args) {

       int i,j;
       double sum = 0,n = 1;
       for(i=1;i<=20;i++){
           n=n*i;
           sum = sum + n;
       }
       System.out.print(sum);

   }

}
求1+2!+3!+...+20!的和