递归算法之斐波那契数列

 1 public class MainClass
 2 {
 3     public static void Main() 
 4     {
 5         Console.WriteLine(Foo(30));
 6     }
 7  
 8     public static int Foo(int i)
 9     {
10         if (i <= 0)
11             return 0;
12         else if(i > 0 && i <= 2)
13             return 1;
14         else return Foo(i -1) + Foo(i - 2);
15     }
16 }