我不知道BigIntegers哪里出了问题

Question

下面是我的BigInteger代码，我不知道我哪里出错了，有人能纠正我的代码吗？

import java.math.BigInteger;
import java.util.Scanner;

public class Class2 {

    public static void main(String[] args) {    
        Scanner num = new Scanner(System.in);
        System.out.println("Enter BigInteger number : ");
        BigInteger nbn = num.nextBigInteger();

        for(BigInteger count = BigInteger.ZERO;
                count.compareTo(nbn) <= 0;
                count.add(BigInteger.ONE)) {
            System.out.println(count);
        }
    }
}

Answer 1

将count.add(BigInteger.ONE)的值赋值给count

for (BigInteger count = BigInteger.ZERO;
        count.compareTo(nbn) <= 0;
        count = count.add(BigInteger.ONE)) {
    System.out.println(count);
}