LeetCode 9 Palindrome Number

9. Palindrome Number

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Total Accepted: 116450 Total
Submissions: 370999 Difficulty: Easy

Determine whether an integer is a palindrome. Do this without extra space.
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判断一个数是不是回文数

如果是负数，直接返回false;

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class Solution {
public:
bool isPalindrome(int x)
{
if(x<0)
return false;
char num[20];
sprintf(num,"%d",x);
int len=strlen(num);
for(int i=0,j=len-1;i<=j;i++,j--)
if(num[i]!=num[j])
return false;
return true;
}
};