JAVA:阶乘求和!

问题:从键盘读入一个数,输出从1加到本身的阶乘和!

代码:

package day;
import java.util.Scanner;
public class Day0403 {

public static void main(String[] args) {
	// TODO Auto-generated method stub
	Scanner sc = new Scanner(System.in);
	int sum1 = 1 ,sum2 = 0;
	System.out.println("please input number:");
	int a = sc.nextInt();
	for(int i = 1 ; i <= a ; i++) {
		sum1 *= i;
		sum2 += sum1;
	}
	System.out.print("阶乘和为:" + sum2);
}

}