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int num=0;
do
{
Console.WriteLine("请输入一个数");
string readStr = Console.ReadLine();
if (int.TryParse(readStr, out num))
{
if (num > 0)
{
for (int index = readStr.Length - 1; index >= 0; index--)
{
Console.Write(readStr[index]);
}
}
}
}
while (num <= 0);
Console.ReadKey();
void Main()
{
string test = "123";
Console.WriteLine(new string(test.ToCharArray().Reverse().ToArray()));
//321
}