4.2.到100的累乘

package study;

import java.math.BigInteger;

public class Main {
	public static BigInteger sum = BigInteger.valueOf(1);
	public static BigInteger climb(int n) {
		if(n!=1) {
			BigInteger num =BigInteger.valueOf(n);
			sum = sum.multiply(num);
			climb(--n);
			//return BigInteger.valueOf(n).multiply(climb(n-1));
		}
		return sum;
		//return BigInteger.ONE;
	}
	public static void main(String[] args) {
		System.out.println(climb(100));
	}
}

//递归结果太大,int和long已经无法满足