1024! 末尾有多少个0？

namespace MyNameSpace

{

class MyClass

{

static void Main()

{

System.Console.WriteLine(new MyClass().CountZero(1024));

System.Console.ReadKey();

}

public int CountZero(int num)

{

int result = 0;

while (num > 5)

{

num = (num - (num % 5)) / 5;

result += num;

}

return result;

}

}

}