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 程式師世界 >> 編程語言 >> C語言 >> 關於C語言 >> 9. Palindrome Number,palindromenumber

9. Palindrome Number,palindromenumber

編輯:關於C語言

9. Palindrome Number,palindromenumber


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

click to show spoilers.

Some hints:

Could negative integers be palindromes? (ie, -1)

If you are thinking of converting the integer to string, note the restriction of using extra space.

You could also try reversing an integer. However, if you have solved the problem "Reverse Integer", you know that the reversed integer might overflow. How would you handle such case?

題目:判斷整數是不是回文數

 1 bool isPalindrome(int x) {
 2     int temp;
 3     int n = 0;
 4     temp = x;
 5     if(x < 0)
 6         return 0;
 7     while(temp)
 8     {
 9         n = n*10 + temp % 10;           
10         temp = temp /10;
11     }
12     return (n == x);
13 }

 

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