leetcode 7

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public class Solution {
    public int reverse(int x)
    {
    
     int result = 0;
     while (x != 0)
     {
            int tail = x % 10;
            int newResult = result * 10 + tail;
            if ((newResult - tail) / 10 != result)
            { return 0; }
            result = newResult;
            x = x / 10;
        }

        return result;
    }
}

取模！！