【JAVA习题十八】求1+2!+3!+...+20!的和
package erase; import java.util.Scanner; public class 阶乘数相加 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); int n=in.nextInt(); Jieshu(n); } public static void Jieshu(int n) { int sum = 0; for(int i=1;i<=n;i++) { int count = 1; for(int j=1;j<=i;j++) { count*=j; } sum+=count; } System.out.print(sum); } }