leetcode Palindrome Number

负数被设定为不是回文数

#include<iostream>

using namespace std;

int F(int t)
{
    int f = 1;
    for (int i = 0; i < t; i++)
        f = f * 10;
    return f;
}

bool isPalindrome(int x) 
{
    int m = x;
    int L = 0;
    while (m > 0)
    {
        m = m / 10;
        L++;
    }
    int n = L / 2;
    while (n>0)
    {
        int m = F(L - 1);
        int c = x / m;
        int t = x % 10;
        if (t != c)
        {
            return false;
        }
        x = x % m;
        x = x / 10;
        L = L - 2;
        n--;
    }
    return true;
}

int main()
{
    cout << isPalindrome(2321);
}