C#递归题目实例代码

{

public static void Main()

{

Console.WriteLine(Foo(30));

}

public static int Foo(int i)

{

if (i <= 0)

return 0;

else if(i > 0 && i <= 2)

return 1;

else return Foo(i -1) + Foo(i - 2);

}

}