leetcode Palindrome Number

负数被设定为不是回文数
 1 #include<iostream>
 2 
 3 using namespace std;
 4 
 5 int F(int t)
 6 {
 7     int f = 1;
 8     for (int i = 0; i < t; i++)
 9         f = f * 10;
10     return f;
11 }
12 
13 bool isPalindrome(int x) 
14 {
15     int m = x;
16     int L = 0;
17     while (m > 0)
18     {
19         m = m / 10;
20         L++;
21     }
22     int n = L / 2;
23     while (n>0)
24     {
25         int m = F(L - 1);
26         int c = x / m;
27         int t = x % 10;
28         if (t != c)
29         {
30             return false;
31         }
32         x = x % m;
33         x = x / 10;
34         L = L - 2;
35         n--;
36     }
37     return true;
38 }
39 
40 int main()
41 {
42     cout << isPalindrome(2321);
43 }