https://www.youtube.com/watch?v=8P38bW3pPgU&list=PLO56HZSjrPTB4NxAsEP8HRk6YKBDLbp7m&index=85
https://docs.microsoft.com/ko-kr/dotnet/csharp/whats-new/csharp-9
using System;
namespace Dinner
{
class Program
{
// 피보나치 수열
static int Fib(int i)
{
if(i <= 2)
{
return 1;
}
return Fib(i - 2) + Fib(i - 1);
}
static void Main(string[] args)
{
Console.WriteLine($"20번째 : {Fib(20)}");
}
}
}