코드의 흐림제어

using System.Collections.Generic;
 
namespace _05_Code
{
    //형식패턴 클래스 선언
    class Preschooler { }
    class Underage { }
    class Adult { }
    class Senior { }
 
 
    internal class Program
    {
 
        #region 형식 패턴 
        static int CalculateFee(object visitor)
        {
            return visitor switch
            {
                Underage => 100,
                Adult => 500,
                Senior => 200,
                _ => throw new ArgumentException($"Prohibited age : {visitor.GetType()}", nameof(visitor)),
            };
        }
        #endregion
 
        #region 프로퍼티 패턴
        class Car
        {
            public string Model { get; set; }
            public DateTime ProducedAt { get; set; }
        }
 
        static string GetNickname(Car car)
        {
            /*
            //if 문
            var GenerateMessage = (Car car, string nickname) => $"{car.Model} produced in {car.ProducedAt} is {nickname}";
 
            if (car is Car { Model: "Mustang", ProducedAt.Year: 1967 })
                return GenerateMessage(car, "Fastback");
            else if (car is Car { Model: "Mustang", ProducedAt.Year: 1976 })
                return GenerateMessage(car, "Cobra II");
            else
                return GenerateMessage(car, "Unknown");
            */
 
            var GenerateMessage = (Car car, string nickname) => $"{car.Model} produced in {car.ProducedAt} is {nickname}";
 
            return car switch
            {
                { Model: "Mustang", ProducedAt.Year: 1967 } => GenerateMessage(car, "Fastback"),
                { Model: "Mustang", ProducedAt.Year: 1976 } => GenerateMessage(car, "Cobra II"),
                _ => GenerateMessage(car, "Unknown")
            };
        }
        #endregion
 
        #region 논리패턴
        class OrderItem
        {
            public int Amount { get; set; }
            public int Price { get; set; }
        }
 
        static double GetPrice(OrderItem orderitem) => orderitem switch
        {
            OrderItem { Amount: 0 } or OrderItem { Price: 0 } => 0.0,
            OrderItem { Amount: >= 100 } and OrderItem { Price: >= 10_000 } => orderitem.Amount * orderitem.Price * 0.8,
            not OrderItem { Amount: < 100 } => orderitem.Amount * orderitem.Price * 0.9,
            _ => orderitem.Amount * orderitem.Price,
        };
 
        #endregion
 
        #region 괄호패턴
        struct Audience
        {
            public bool IsCitizen { get; set; }
            public int Age { get; set; }
 
            public Audience(bool isCitizen, int age)
            {
                IsCitizen = isCitizen;
                Age = age;
            }
 
            public void Deconstruct(out bool isCitizen, out int age)
            {
                isCitizen = IsCitizen;
                age = Age;
            }
        }
        #endregion
 
        static void Main(string[] args)
        {
            /*
            Console.WriteLine("숫자를입력하세요");
 
            string input = Console.ReadLine(); //사용자로부터 문자열을 입력받아 그 결과를 반환하는 기능
            int number = Int32.Parse(input);
 
            if (number < 0)
                Console.WriteLine("음수");
            else if (number > 0)
                Console.WriteLine("양수");
            else
                Console.WriteLine("0");
 
            if (number % 2 == 0)
                Console.WriteLine("짝수");
            else
                Console.WriteLine("홀수");
 
            if (number > 0)
            {
                if (number % 2 == 0)
                    Console.WriteLine("짝수");
                else
                    Console.WriteLine("홀수");
            }
            else
            {
                Console.WriteLine("0보다 작거나 같은 수");
            }
            */
 
 
            /*
            Console.WriteLine("요일을 입력하세요 (일,월,화,수,목,금,토) : ");
            string day = Console.ReadLine();
 
 
            switch (day)
            {
                case "일":
                    Console.WriteLine("Sunday");
                    break;
                case "월":
                    Console.WriteLine("Monday");
                    break;
                case "화":
                    Console.WriteLine("Tuesday");
                    break;
                case "수":
                    Console.WriteLine("Wednesday");
                    break;
                case "목":
                    Console.WriteLine("Thursday");
                    break;
                case "금":
                    Console.WriteLine("Friday");
                    break;
                case "토":
                    Console.WriteLine("Saturday");
                    break;
                default:
                    Console.WriteLine($"{day}는(은) 요일이 아닙니다.");
                    break;
            } 
            */
 
            /*
            object obj = null;
 
            string s = Console.ReadLine();
 
            if (int.TryParse(s, out int out_i))
                obj = out_i;
            else if (float.TryParse(s, out float out_f))
                obj = out_f;
            else
                obj = s;
 
            switch (obj)
            {
                case int:
                    Console.WriteLine($"{(int)obj}는 int 형식입니다");
                    break;
                case float f when f >= 1.5 :
                    Console.WriteLine($"{(float)obj}는 float 형식입니다1.5");
 
                    break;
                default:
                    Console.WriteLine($"{obj}(은)는 모르는 형식입니다.");
                    break;
            }
            */
 
            /*
            Console.WriteLine("점수를 입력하세요");
            int score = Convert.ToInt32(Console.ReadLine());
 
            Console.WriteLine("재수강인가요?(Y/N)");
            string line = Console.ReadLine();
            
            bool repeated = line == "Y"?true:false;
 
            string grade = (int)(Math.Truncate(score / 10.0) * 10) switch
            {
                90 when repeated == true => "B+",
                90 =>"A",
                80 =>"B",
                70 =>"C",
                60 =>"D",
                _ => "F"
            };
 
            Console.WriteLine($"학점 : {grade}");
            */
 
            /*
            int i = 10;
 
            while (i > 0)
            {
                Console.WriteLine($"i : {i--}");
            }
            */
 
            /*
            int i = 10;
 
            do
            {
                Console.WriteLine("a) i : {0}",i--);
            } while (i > 0);
 
            do
            {
                Console.WriteLine("b) i : {0}", i--);
            } while (i > 0);
            */
 
 
            /*
            for (int i= 0; i <5; i++)
            {
                Console.WriteLine(i);
            }
            */
 
            /*
            for (int i = 0; i < 5; i++)
            {
                for (int j = 0; j <= i; j++)
                {
                    Console.WriteLine("*");
                }
                Console.WriteLine();
            }
            */
 
 
            /*
            int[] arr = new int[] { 0, 1, 2, 3, 4 };
 
            foreach ( int a in arr)
            {
                Console.WriteLine(a);
            }
            */
 
            /*
            int i = 0;
 
            //for (; ; )
            //    Console.WriteLine(i++);
         
            while(true)
            {
                Console.WriteLine(i++);
            }
            */
 
            /*
            while (true)
            {
                Console.WriteLine("계속할까요?(예/아니오)");
                string answer = Console.ReadLine();
 
                if (answer == "아니오")
                    break;
            }
            */
 
            /*
            for (int i = 0; i < 10; i++)
            {
                if (i % 2 == 0)
                    continue;
 
                Console.WriteLine($"{i} : 홀수");
            }
            */
 
            /*
            Console.WriteLine("종료 조건(숫자)을 입력하세요 :");
            string input = Console.ReadLine();
 
            int input_number = Convert.ToInt32(input);
 
            int exit_number = 0;
 
            for ( int i = 0; i<2; i++ )
            {
                for ( int j = 0; j < 2; j++)
                {
                    for ( int k = 0; k < 3; k++)
                    {
                        if (exit_number++ == input_number)
                            goto EXIT_FOR;
 
                        Console.WriteLine(exit_number);
                    }
                }
            }
 
            goto EXIT_PROGRAM;
 
            EXIT_FOR:
            Console.WriteLine("/nExit nested for...");
 
            EXIT_PROGRAM:
            Console.WriteLine("Exit program...");
            */
 
            /*
            //선언패턴
            object foo = 23;
 
            if (foo is int bar)
            {
                Console.WriteLine(bar);
            }
            */
 
            /*
            //형식패턴 
            object foo = 23;
            if (foo is int)
            {
                Console.WriteLine(foo);
            }
 
            Console.WriteLine($"Fee for a senior : {CalculateFee(new Senior())}");
            Console.WriteLine($"Fee for a Adult : {CalculateFee(new Adult())}");
            Console.WriteLine($"Fee for a Underage : {CalculateFee(new Underage())}");
            Console.WriteLine($"Fee for a Preschooler : {CalculateFee(new Preschooler())}");
            */
 
            /*
            //상수패턴
            var GetCountryCode = (string nation) => nation switch
            {
                "KR" => 82,
                "US" => 1,
                "UK" => 44,
                _ => throw new ArgumentException("Not supported Code")
            };
 
            Console.WriteLine(GetCountryCode("KR"));
            Console.WriteLine(GetCountryCode("US"));
            Console.WriteLine(GetCountryCode("UK"));
            //Console.WriteLine(GetCountryCode("U1K"));
 
 
            object obj = null;
 
            if (obj is null) //obj == null
            {
                Console.WriteLine("null");
            }
 
            if (obj is not null) //obj != null
            {
                Console.WriteLine("null");
            }
            
            //프로퍼티 패턴
            Console.WriteLine(GetNickname(new Car() { Model = "Mustang", ProducedAt = new DateTime(1967, 11, 23) }));
            Console.WriteLine(GetNickname(new Car() { Model = "Mustang", ProducedAt = new DateTime(1976, 6, 7) }));
            Console.WriteLine(GetNickname(new Car() { Model = "Mustang", ProducedAt = new DateTime(2099, 12, 25) }));
            */
 
            /*
            //관계패턴
            static string GetGrade(double score) => score switch
            {
                < 60 => "F",
                >= 60 and < 70 => "D",
                >= 70 and < 80 => "C",
                >= 80 and < 90 => "B",
                _ => "A",
            };
 
            Console.WriteLine(GetGrade(55));
            Console.WriteLine(GetGrade(70));
            Console.WriteLine(GetGrade(78));
            Console.WriteLine(GetGrade(98));
            */
 
            /*
            //논리패턴
            Console.WriteLine(GetPrice(new OrderItem() { Amount = 0, Price = 10_000 }));
            Console.WriteLine(GetPrice(new OrderItem() { Amount = 100, Price = 10_000 }));
            Console.WriteLine(GetPrice(new OrderItem() { Amount = 100, Price = 9_000 }));
            Console.WriteLine(GetPrice(new OrderItem() { Amount = 1, Price = 1_000 }));
            */
 
            /*
            //괄호패턴
            object age = 30;
            if (age is (int and > 19))
            {
                Console.WriteLine("Major");
            }
            */
 
            /*    
            //위치 패턴
            Tuple<string, int> itemPrice = new Tuple<string, int>("espresso", 3000);
 
            if (itemPrice is ("espresso", < 5000))
            {
                Console.WriteLine("The coffe is affordable.");
            }
            
 
            var CalculateFee = (Audience audience) => audience switch
            {
                (true, < 19) => 100,
                (true, _) => 200,
                (false, < 19) => 200,
                (false, _) => 400,
            };
 
            var a1 = new Audience(true, 10);
            Console.WriteLine($"내국인: {a1.IsCitizen} 나이: {a1.Age} 요금: {CalculateFee(a1)}");
 
            var a2 = new Audience(false, 33);
            Console.WriteLine($"내국인: {a2.IsCitizen} 나이: {a2.Age} 요금: {CalculateFee(a2)}");
            */
 
            /*
            //var 패턴
            //모든 과목이 60점이 넘고, 평균이 60점 이상인 경우에만 Pass
            var IsPassed = (int[] scores) => scores.Sum() / scores.Length is var average
                           && Array.TrueForAll(scores, (score) => score >= 60)
                           && average >= 60;
 
            int[] scores1 = { 90, 80, 60, 80, 70 };
            Console.WriteLine($"{string.Join(",",scores1)}: Pass:{IsPassed(scores1)}");
 
            int[] scores2 = { 90, 80, 59, 80, 70 };
            Console.WriteLine($"{string.Join(",", scores2)}: Pass:{IsPassed(scores2)}");
            */
 
            //목록패턴
         
 
        }
    }
}