Leetcode-Palindrome Number Add to List

Determine whether an integer is a palindrome. Do this without extra space.

class Solution {
public:
	bool isPalindrome(int x) {
		if ((x < 0) || (x > 0 && x % 10 == 0))
			return false;
		char A[100];
		int i = 0, j;
		while (x != 0) {
			A[i++] = x % 10;
			x = x / 10;
		}
		for (j = 0, i; j < i; j++, i--) 
			if (A[j] != A[i - 1])
				return false;
		return true;
	}
};