C#算法之整数反转

输入: 123
输出: 321

输入: -123
输出: -321

输入: 120
输出: 21

public class Solution {
    public int Reverse(int x) {
         
    }
}

   public class Solution
    {
        public int Reverse(int x)
        {

            int num = 0;
            while (x != 0)
            {
                int i = x % 10;
                x = x / 10;
                //C# int32 范围 [-2147483647~2147483647]
                if (num > int.MaxValue / 10 )
                    return 0;
                if (num < int.MinValue / 10)
                    return 0;

                num = num * 10 + i;
            }
            return num;
        }
    }