small-c
int num = Convert.ToInt32(Console.ReadLine());
int min = 0, max = num;

while (max > 0)
{
    min = min * 10 + max % 10;
    max = max / 10;
}

if(min == num)
    Console.Write("是回文数");
else
    Console.Write("不是回文数");

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