JAVA经典算法(二十一)

 题目：求1+2!+3!+...+20!的和

package cn.ls.lanqiao;

public class Test21 {

	public static void main(String[] args) {

		int sum = 1;
		int total = 0;
		for (int i = 1; i <= 20; i++) {
			sum *= i;
			total += sum;
		}
		System.out.println(total);
	}
}