求.NET 朋友!public class MainClass{public static void Main(){Console.WriteLine(Foo(30));Console.ReadLine(); //读取数据,可以使运行结果停留显示}public static int Foo(int i){if(i{return 0;}else if(i>0 && i{return 1;}else{return Foo(i-1)+Foo(i-2);}}}这段代码能帮解释一下么???
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