JAVA语法——n的阶乘（高级）

链接：https://www.nowcoder.com/questionTerminal/f54d8e6de61e4efb8cce3eebfd0e0daa
来源：牛客网

import java.math.BigInteger;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        while(in.hasNextInt()){
             int N = in.nextInt();
             BigInteger sum = BigInteger.valueOf(1);
             for(int i=1;i<=N;i++)
                 sum = sum.multiply(BigInteger.valueOf(i));
             System.out.println(sum);
         }
    }
}