java 求1到n的阶乘和

import java.util.Scanner;


public class jiecheng {


public static void main(String[] args) {
// TODO Auto-generated method stub



// 扫描器，接收控制台输入信息
Scanner  scanner=new Scanner(System.in);
System.out.print("请输入一个的整数：");



try {
// 取出控制台输入的信息 
int number=scanner.nextInt();
long sum=factorialSum(number);
System.out.print("1到"+number+"的阶乘和为"+sum);
} catch (Exception e) {
// TODO: handle exception
System.out.print("请输入整数");

}
}


/**
* 求1到n的阶乘和
* */
public static long factorialSum(int num) {
long sum=0;
long temp=1;
for (int i = 1; i <=num; i++) {
temp*=i;

sum+=temp;
}


return  sum;
}

}