题目描述
Determine whether an integer is a palindrome. Do this without extra space.
题目大意：即检测一个数是否为回文数，不开辟额外的空间
public boolean isPalindrome(int x) {
if (x<0 || (x!=0 && x==0)) return false;
int rev = 0;
while (x>rev){
rev = rev*10 + x;
x = x/10;
}
return (x==rev || x==rev/10);
}
