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Ex1.HelloWorld/Ex1.HelloWorld.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Ex1.HelloWorld/Program.cs

@@ -0,0 +1,7 @@
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        Console.WriteLine("Hello, World!");
+    }
+}

Ex2.Comment/Ex2.Comment.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Ex2.Comment/Program.cs

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+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        // 코멘트: 한 라인 코멘트는 두개의 슬래시 사용함       
+        int a = 1;
+
+
+        int b = 1;  // 코멘트: 하나의 문장 뒤에 코멘트를 달 수 있음
+
+        /*
+           복수 라인에 대한 코멘트
+           int c;
+           int d; 
+        */
+    }
+}

Ex3.DataType/Ex3.DataType.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Ex3.DataType/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+//리터널
+/*
+123    // int 리터럴
+12.3   // double 리터럴
+"A"    // string 리터럴
+'a'    // char 리터럴
+true   // bool 리터럴
+*/
+
+// Bool
+bool b = true;
+
+// Numeric
+short sh = -32768;
+int i = 2147483647;
+long l = 1234L;      // L suffix
+float f = 123.45F;   // F suffix
+double d1 = 123.45;
+double d2 = 123.45D; // D suffix
+decimal d = 123.45M; // M suffix
+
+// Char/String
+char c = 'A';
+string s = "Hello";
+
+// DateTime  2011-10-30 12:35
+DateTime dt = new DateTime(2011, 10, 30, 12, 35, 0);
+
+//최대 최소
+int iMax = int.MaxValue;
+float fMin = float.MinValue;
+
+//null
+string sn;
+sn = null;
+
+// Nullable 타입
+int? inl = null;
+inl = 101;
+
+bool? bnl = null;
+
+//int? 를 int로 할당
+Nullable<int> j = null;
+j = 10;
+int k = j.Value;

Ex4.VariableConstant/Ex4.VariableConstant.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Ex4.VariableConstant/Program.cs

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+class CSVar
+{
+    //필드 (클래스 내에서 공통적으로 사용되는 전역 변수)
+    int globalVar;
+    const int MAX = 1024;
+
+    public void Method1()
+    {
+        // 로컬변수
+        int localVar;
+
+        // 아래 할당이 없으면 에러 발생
+        localVar = 100;
+
+        Console.WriteLine(globalVar);
+        Console.WriteLine(localVar);
+    }
+}
+
+class CSVar2
+{
+    // 상수
+    const int MAX_VALUE = 1024;
+
+    // readonly 필드 
+    readonly int Max;
+    public CSVar2()
+    {
+        Max = 1;
+    }
+
+    //...
+}
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        // 테스트
+        CSVar obj = new CSVar();
+        obj.Method1();
+    }
+}

Ex5.Array/Ex5.Array.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Ex5.Array/Program.cs

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+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        // 1차 배열
+        string[] players = new string[10];
+        string[] Regions = { "서울", "경기", "부산" };
+
+        // 2차 배열 선언 및 초기화
+        string[,] Depts = { { "김과장", "경리부" }, { "이과장", "총무부" } };
+
+        // 3차 배열 선언
+        string[,,] Cubes;
+
+        //Jagged Array (가변 배열)
+        //1차 배열 크기(3)는 명시해야
+        int[][] A = new int[3][];
+
+        //각 1차 배열 요소당 서로 다른 크기의 배열 할당 가능
+        A[0] = new int[2];
+        A[1] = new int[3] { 1, 2, 3 };
+        A[2] = new int[4] { 1, 2, 3, 4 };
+
+        A[0][0] = 1;
+        A[0][1] = 2;
+
+        int[] scores = { 80, 78, 60, 90, 100 };
+        int sum = CalculateSum(scores); // 배열 전달: 배열명 사용
+        Console.WriteLine(sum);
+    }
+
+    static int CalculateSum(int[] scoresArray) // 배열 받는 쪽
+    {
+        int sum = 0;
+        for (int i = 0; i < scoresArray.Length; i++)
+        {
+            sum += scoresArray[i];
+        }
+        return sum;
+    }
+}

Ex6.String/Ex6.String.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Ex6.String/Program.cs

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+// See https://aka.ms/new-console-template for more information
+// 문자열(string) 변수
+using System.Text;
+
+string s1 = "C#";
+string s2 = "Programming";
+
+// 문자(char) 변수 
+char c1 = 'A';
+char c2 = 'B';
+
+// 문자열 결합
+string s3 = s1 + " " + s2;
+Console.WriteLine("String: {0}", s3);
+
+// 부분문자열 발췌
+string s3substring = s3.Substring(1, 5);
+Console.WriteLine("Substring: {0}", s3substring);
+
+string s = "C# Studies";
+
+// 문자열을 배열인덱스로 한문자 엑세스 
+for (int i = 0; i < s.Length; i++)
+{
+    Console.WriteLine("{0}: {1}", i, s[i]);
+}
+
+// 문자열을 문자배열로 변환
+string str = "Hello";
+char[] charArray = str.ToCharArray();
+
+for (int i = 0; i < charArray.Length; i++)
+{
+    Console.WriteLine(charArray[i]);
+}
+
+// 문자배열을 문자열로 변환
+char[] charArray2 = { 'A', 'B', 'C', 'D' };
+s = new string(charArray2);
+
+Console.WriteLine(s);
+
+// 문자 연산
+char c3 = 'A';
+char c4 = (char)(c3 + 3);
+Console.WriteLine(c3);  // D 출력
+
+//StringBuilder 사용
+StringBuilder sb = new StringBuilder();
+for (int i = 1; i <= 26; i++)
+{
+    sb.Append(i.ToString());
+    sb.Append(System.Environment.NewLine);
+}
+string sbstr = sb.ToString();
+
+Console.WriteLine(sbstr);

Ex7.Enum/Ex7.Enum.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Ex7.Enum/Program.cs

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+internal class Program
+{
+    enum City
+    {
+        Seoul,   // 0
+        Daejun,  // 1
+        Busan = 5,  // 5
+        Jeju = 10   // 10
+    }
+
+    [Flags]
+    enum Border
+    {
+        None = 0,
+        Top = 1,
+        Right = 2,
+        Bottom = 4,
+        Left = 8
+    }
+
+    private static void Main(string[] args)
+    {
+        City myCity;
+
+        // enum 타입에 값을 대입하는 방법
+        myCity = City.Seoul;
+
+        // enum을 int로 변환(Casting)하는 방법. 
+        // (int)를 앞에 지정.
+        int cityValue = (int)myCity;
+
+        if (myCity == City.Seoul) // enum 값을 비교하는 방법
+        {
+            Console.WriteLine("Welcome to Seoul");
+        }
+
+        // OR 연산자로 다중 플래그 할당
+        Border b = Border.Top | Border.Bottom;
+
+        // & 연산자로 플래그 체크
+        if ((b & Border.Top) != 0)
+        {
+            //HasFlag()이용 플래그 체크
+            if (b.HasFlag(Border.Bottom))
+            {
+                // "Top, Bottom" 출력
+                Console.WriteLine(b.ToString());
+            }
+        }
+
+    }
+}

Ex8.Operators/Ex8.Operators.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Ex8.Operators/Program.cs

@@ -0,0 +1,37 @@
+// See https://aka.ms/new-console-template for more information
+int x, y, z, b, c, d;
+x = y = z = b = c = d = 2;
+
+//산술연산자
+int a = (x + y - z) * (b / c) % d;
+
+//할당연산자
+int sum = 0;
+sum += a;
+
+//증감연산자
+sum++;
+--sum;
+
+//논리연산자
+bool isOk = true;
+if ((a > 1 && b < 0) || c == 1 || !isOk);
+
+//비교연산자
+if (a <= b)
+{
+    int rst = b - a;
+}
+
+//비트연산자
+byte b1 = 7;
+int b4 = (b1 & 3) | 4 ^ 5;
+
+//비트이동연산자
+int i = 2;
+i = i << 5;
+
+//조건연산자
+int val = (a > b) ? a : b;
+string str = null;
+string s = str ?? "(널)";

Ex9.Condition/Ex9.Condition.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Ex9.Condition/Program.cs

@@ -0,0 +1,70 @@
+using System.Diagnostics;
+
+internal class Program
+{
+    static bool verbose = false;
+    static bool continueOnError = false;
+    static bool logging = false;
+
+    private static void Main(string[] args)
+    {
+        int a = -11;
+        int val;
+        if (a >= 0)
+        {
+            val = a;
+        }
+        else
+        {
+            val = -a;
+        }
+
+        // 출력값 : 11
+        Console.Write(val);
+
+        Console.WriteLine("과일 이름?");
+        var category = Console.ReadLine();
+        int price;
+        switch (category)
+        {
+            case "사과":
+                price = 1000;
+                break;
+            case "딸기":
+                price = 1100;
+                break;
+            case "포도":
+                price = 900;
+                break;
+            default:
+                price = 0;
+                break;
+        }
+        
+        Console.WriteLine($"{category} 가격은 {price} 입니다.");
+
+        if (args.Length != 1)
+        {
+            Console.WriteLine("Usage: MyApp.exe option");
+            return;
+        }
+
+        string option = args[0];
+        switch (option.ToLower())
+        {
+            case "/v":
+            case "/verbose":
+                verbose = true;
+                break;
+            case "/c":
+                continueOnError = true;
+                break;
+            case "/l":
+                logging = true;
+                break;
+            default:
+                Console.WriteLine("Unknown argument: {0}", option);
+                break;
+        }
+    }
+}

ExA.Loop/ExA.Loop.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExA.Loop/Program.cs

@@ -0,0 +1,73 @@
+// See https://aka.ms/new-console-template for more information
+
+// for 루프
+using System.Diagnostics;
+
+for (int x = 0; x < 10; x++)
+{
+    Console.WriteLine("Loop {0}", x);
+}
+
+string[] array = new string[] { "AB", "CD", "EF" };
+
+// foreach 루프
+foreach (string s in array)
+{
+    Console.WriteLine(s);
+}
+
+// 3차배열 선언
+string[,,] arr = new string[,,] {
+            { {"1", "2"}, {"11","22"} },
+            { {"3", "4"}, {"33", "44"} }
+    };
+
+//for 루프 : 3번 루프를 만들어 돌림
+for (int i = 0; i < arr.GetLength(0); i++)
+{
+    for (int j = 0; j < arr.GetLength(1); j++)
+    {
+        for (int k = 0; k < arr.GetLength(2); k++)
+        {
+            Debug.WriteLine(arr[i, j, k]);
+        }
+    }
+}
+
+//foreach 루프 : 한번에 3차배열 모두 처리
+foreach (var s in arr)
+{
+    Debug.WriteLine(s);
+}
+
+int y = 1;
+
+// while 루프
+while (y <= 10)
+{
+    Console.WriteLine(y);
+    y++;
+}
+
+y = 0;
+// do ~ while 루프
+do
+{
+    Console.WriteLine(y);
+    y++;
+} while (y < 10);
+
+//Enumerable 
+List<char> keyList = new List<char>();
+ConsoleKeyInfo key;
+do
+{
+    key = Console.ReadKey();
+    keyList.Add(key.KeyChar);
+} while (key.Key != ConsoleKey.Q); // Q가 아니면 계속
+
+Console.WriteLine();
+foreach (char ch in keyList) // 리스트 루프
+{
+    Console.Write(ch);
+}

ExB.Yield/ExB.Yield.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExB.Yield/Program.cs

@@ -0,0 +1,50 @@
+internal class Program
+{
+    static IEnumerable<int> GetNumber()
+    {
+        yield return 10;  // 첫번째 루프에서 리턴되는 값
+        yield return 20;  // 두번째 루프에서 리턴되는 값
+        yield return 30;  // 세번째 루프에서 리턴되는 값
+    }
+
+    public class MyList
+    {
+        private int[] data = { 1, 2, 3, 4, 5 };
+
+        public IEnumerator<int> GetEnumerator()
+        {
+            int i = 0;
+            while (i < data.Length)
+            {
+                yield return data[i];
+                i++;
+            }
+        }
+
+        //...
+    }
+
+
+    private static void Main(string[] args)
+    {
+        foreach (int num in GetNumber())
+        {
+            Console.WriteLine(num);
+        }
+
+        // (1) foreach 사용하여 Iteration
+        var list = new MyList();
+
+        foreach (var item in list)
+        {
+            Console.WriteLine(item);
+        }
+
+        // (2) 수동 Iteration
+        IEnumerator<int> it = list.GetEnumerator();
+        it.MoveNext();
+        Console.WriteLine(it.Current);  // 1
+        it.MoveNext();
+        Console.WriteLine(it.Current);  // 2
+    }
+}

ExC.Exception/ExC.Exception.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExC.Exception/Program.cs

@@ -0,0 +1,64 @@
+class MyException : Exception
+{
+    public string MyMessage = string.Empty;
+    public MyException(string message, Exception ex) :base(ex.Message)
+    {
+        MyMessage = message;
+    }
+}
+
+internal class Program
+{
+    static void Step1()
+    {
+        throw new IndexOutOfRangeException();
+    }
+    static void Step2()
+    {
+        throw new FileNotFoundException();
+    }
+    static void Step3()
+    {
+        throw new Exception();
+    }
+    static bool Log(Exception ex)
+    {
+        Console.WriteLine($"{DateTime.Now.ToString("yy/MM/dd HH:mm:ss")} - {ex.Message}");
+        return true;
+    }
+
+    private static void Main(string[] args)
+    {
+        try
+        {
+            // 실행 문장들
+            Step1();
+            Step2();
+            Step3();
+        }
+        catch (IndexOutOfRangeException ex)
+        {
+            // 새로운 Exception 생성하여 throw
+            throw new MyException("Invalid index", ex);
+        }
+        catch (FileNotFoundException ex)
+        {
+            bool success = Log(ex);
+            if (!success)
+            {
+                // 기존 Exception을 throw
+                throw ex;
+            }
+        }
+        catch (Exception ex)
+        {
+            Log(ex);
+            // 발생된 Exception을 그대로 호출자에 전달
+            throw;
+        }
+        finally
+        {
+            //TODO 사용한 메모리 정리 코드
+        }
+    }
+}

ExD.NameSpace/ExD.NameSpace.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExD.NameSpace/Program.cs

@@ -0,0 +1,21 @@
+using MySystem.MySubSystem;
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        Class1 cls = new MySystem.MySubSystem.Class1();
+    }
+}
+
+namespace MySystem.MySubSystem
+{
+    public class Class1
+    {
+        public int Calculate(int a, int b)
+        {
+            int abs_Sum = System.Math.Abs(a) + Math.Abs(b);
+            return abs_Sum;
+        }
+    }
+}

ExE.Struct/ExE.Struct.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExE.Struct/Program.cs

@@ -0,0 +1,45 @@
+internal class Program
+{
+    // 구조체 정의
+    struct MyPoint
+    {
+        public int X;
+        public int Y;
+
+        public MyPoint(int x, int y)
+        {
+            this.X = x;
+            this.Y = y;
+        }
+
+        public override string ToString()
+        {
+            return string.Format("({0}, {1})", X, Y);
+        }
+    }
+
+    sealed class MyPointC
+    {
+        public int X;
+        public int Y;
+
+        public MyPointC(int x, int y)
+        {
+            this.X = x;
+            this.Y = y;
+        }
+
+        public override string ToString()
+        {
+            return string.Format("({0}, {1})", X, Y);
+        }
+    }
+
+    private static void Main(string[] args)
+    {
+        // 구조체 사용
+        MyPoint pt = new MyPoint(10, 12);
+        Console.WriteLine(pt.ToString());
+
+    }
+}

ExF.Class/ExF.Class.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExF.Class/MyCustomer.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExF.Class
+{
+    public class MyCustomer
+    {
+        // 필드
+        private string name;
+        private int age;
+
+        // 이벤트 
+        public event EventHandler NameChanged;
+
+        // 생성자 (Constructor)
+        public MyCustomer()
+        {
+            name = string.Empty;
+            age = -1;
+        }
+
+        // 속성
+        public string Name
+        {
+            get { return this.name; }
+            set
+            {
+                if (this.name != value)
+                {
+                    this.name = value;
+                    if (NameChanged != null)
+                    {
+                        NameChanged(this, EventArgs.Empty);
+                    }
+                }
+            }
+        }
+        public int Age
+        {
+            get { return this.age; }
+            set { this.age = value; }
+        }
+
+        // 메서드
+        public string GetCustomerData()
+        {
+            string data = string.Format("Name: {0} (Age: {1})",
+                        this.Name, this.Age);
+            return data;
+        }
+    }
+
+}

ExF.Class/Program.cs

@@ -0,0 +1,13 @@
+using ExF.Class;
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        MyCustomer customer1 = new MyCustomer();
+        MyCustomer customer2 = new();
+        var customer3 = new MyCustomer();
+        
+        
+    }
+}

ExG.Nullable/ExG.Nullable.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExG.Nullable/Program.cs

@@ -0,0 +1,43 @@
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        MyClass cls = new();
+        cls.NullableTest();
+    }
+
+}
+
+class MyClass
+{
+    double _Sum = 0;
+    DateTime _Time;
+    bool? _Selected;
+
+    public void CheckInput(int? i, double? d, DateTime? time, bool? selected)
+    {
+        if (i.HasValue && d.HasValue)
+            this._Sum = (double)i.Value + (double)d.Value;
+
+        // time값이 있는 체크.
+        if (!time.HasValue)
+            throw new ArgumentException();
+        else
+            this._Time = time.Value;
+
+        // 만약 selected가 NULL이면 false를 할당
+        this._Selected = selected ?? false;
+    }
+    public void NullableTest()
+    {
+        int? a = null;
+        int? b = 0;
+        int result = Nullable.Compare<int>(a, b);
+        Console.WriteLine(result); //결과 -1
+
+        double? c = 0.01;
+        double? d = 0.0100;
+        bool result2 = Nullable.Equals<double>(c, d);
+        Console.WriteLine(result2); //결과 true
+    }
+}

ExH.Parameters/ExH.Parameters.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExH.Parameters/Program.cs

@@ -0,0 +1,65 @@
+internal class Program
+{
+    private void Calculate(int a)
+    {
+        a *= 2;
+    }
+    static double GetData(ref int a, ref double b)
+    { return ++a * ++b; }
+
+    // out 정의
+    static bool GetData(int a, int b, out int c, out int d)
+    {
+        c = a + b;
+        d = a - b;
+        return true;
+    }
+
+    int Calc(int a, int b, string calcType = "+")
+    {
+        switch (calcType)
+        {
+            case "+":
+                return a + b;
+            case "-":
+                return a - b;
+            case "*":
+                return a * b;
+            case "/":
+                return a / b;
+            default:
+                throw new ArithmeticException();
+        }
+    }
+
+    double Calc(params double[] doubles)
+    {
+        return doubles.Sum();
+    }
+
+    private static void Main(string[] args)
+    {
+        Program p = new Program();
+
+        int val = 100;
+        p.Calculate(val);
+        // val는 그대로 100
+        Console.WriteLine($"val = {val} ");
+
+        // ref 사용. 초기화 필요.
+        int x = 1;
+        double y = 1.0;
+        double ret = GetData(ref x, ref y);
+        Console.WriteLine($"x = {x}, y = {y} ");
+
+        // out 사용. 초기화 불필요.
+        int c, d;
+        bool bret = GetData(10, 20, out c, out d);
+        Console.WriteLine($"c = {c}, d = {d} ");
+
+        p.Calc(1, 2);
+        p.Calc(4, 3, "-");
+        p.Calc(1.1, 2.2, 3.3, 4.4);
+
+    }
+}

ExI.Event/ExI.Event.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExI.Event/MyClass.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExI.Event
+{
+    class MyClass
+    {
+        public event EventHandler<EventArgs>? Complished;
+        
+        public void Calc(int complexity)
+        {
+            Thread.Sleep(complexity);
+            Complished?.Invoke(this, EventArgs.Empty);
+        }
+    }
+}

ExI.Event/Program.cs

@@ -0,0 +1,12 @@
+// See https://aka.ms/new-console-template for more information
+using ExI.Event;
+
+var mycls = new MyClass();
+mycls.Complished += Mycls_Complished;
+
+void Mycls_Complished(object? sender, EventArgs e)
+{
+    Console.WriteLine("작업끝");
+}
+
+mycls.Calc(2000);

ExJ.Preprocessor/ExJ.Preprocessor.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExJ.Preprocessor/Program.cs

@@ -0,0 +1,76 @@
+#define TEST_ENV
+#define STANDARD_EDITION
+#define ENTERPRISE_EDITION
+
+#if (!ENTERPRISE_EDITION)
+#warning This class should be used in Enterprise Edition
+#elif (!STANDARD_EDITION)
+#error 최소 스탠다드 버젼은 되어야합니다.
+#else
+class EnterpriseClass
+{
+
+}
+#endif
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        bool verbose = false;
+        // ...
+
+#if (TEST_ENV)
+            Console.WriteLine("Test Environment: Verbose option is set.");
+            verbose = true;
+#else
+        Console.WriteLine("Production");
+#endif
+
+        if (verbose)
+        {
+            //....
+        }
+
+    }
+}
+
+
+class ClassA
+{
+    #region Public Methods        
+    public void Run() { }
+    public void Create() { }
+    #endregion
+
+    #region Public Properties
+    public int Id { get; set; }
+    #endregion
+
+    #region Privates
+    private void Execute() { }
+    #endregion
+}
+
+#pragma warning disable 3021
+
+namespace App1
+{
+    [System.CLSCompliant(false)]
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            //...
+
+#pragma warning disable
+            if (false)
+            {
+                Console.WriteLine("TBD");
+            }
+#pragma warning restore
+
+            //...
+        }
+    }
+}

ExK.Indexer/ExK.Indexer.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExK.Indexer/Program.cs

@@ -0,0 +1,47 @@
+internal class Program
+{
+    class MyClass
+    {
+        private const int MAX = 10;
+        private string name;
+
+        // 내부의 정수 배열 데이타
+        private int[] data = new int[MAX];
+
+        // 인덱서 정의. int 파라미터 사용
+        public int this[int index]
+        {
+            get
+            {
+                if (index < 0 || index >= MAX)
+                {
+                    throw new IndexOutOfRangeException();
+                }
+                else
+                {
+                    // 정수배열로부터 값 리턴
+                    return data[index];
+                }
+            }
+            set
+            {
+                if (!(index < 0 || index >= MAX))
+                {
+                    // 정수배열에 값 저장
+                    data[index] = value;
+                }
+            }
+        }
+    }
+
+    private static void Main(string[] args)
+    {
+        MyClass cls = new MyClass();
+
+        // 인덱서 set 사용
+        cls[1] = 1024;
+
+        // 인덱서 get 사용
+        int i = cls[1];
+    }
+}

ExL.AccessModifier/ExL.AccessModifier.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExL.AccessModifier/Program.cs

@@ -0,0 +1,24 @@
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        var mycls = new MyClass();
+        mycls.Name = "철수";
+        mycls.Run(100);
+        //mycls._id = 100; //에러
+        //mycls.Execute() //에러
+    }
+
+
+    internal class MyClass
+    {
+        private int _id = 0;
+
+        public string Name { get; set; }
+
+        public void Run(int id) { }
+
+        protected void Execute() { }
+    }
+
+}

ExM.Inheritance/ExM.Inheritance.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExM.Inheritance/Program.cs

@@ -0,0 +1,113 @@
+// 베이스 클래스
+public class Animal
+{
+    public string Name { get; set; }
+    public int Age { get; set; }
+}
+
+// 파생클래스
+public class Dog : Animal
+{
+    public void HowOld()
+    {
+        // 베이스 클래스의 Age 속성 사용
+        Console.WriteLine("나이: {0}", this.Age);
+    }
+}
+
+public class Bird : Animal
+{
+    public void Fly()
+    {
+        Console.WriteLine("{0}가 날다", this.Name);
+    }
+}
+
+
+public class VirBase
+{
+    public virtual void Say()
+    {
+        Console.WriteLine("Hello");
+    }
+}
+
+public class SpeakerA : VirBase
+{
+    public override void Say()
+    {
+        Console.WriteLine("World");
+    }
+}
+
+public abstract class PureBase
+{
+    // abstract C#키워드 
+    public abstract int GetFirst();
+    public abstract int GetNext();
+}
+
+public class DerivedA : PureBase
+{
+    private int no = 1;
+
+    // override C#키워드 
+    public override int GetFirst()
+    {
+        return no;
+    }
+
+    public override int GetNext()
+    {
+        return ++no;
+    }
+}
+
+public class MyBase
+{
+    public string Name { get; set; }
+    protected int Age { get; set; }
+}
+
+public class MyDerived : MyBase
+{
+    public void Run()
+    {
+        // 파생클래스이므로 Age 사용 가능
+        Console.WriteLine("나이: {0}", this.Age);
+    }
+}
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        var dog = new Dog();
+        dog.Name = "멍멍이";
+        dog.Age = 10;
+        var bird = new Bird();
+        bird.Name = "삐약이";
+
+        dog.HowOld();
+        bird.Fly();
+
+        Animal[] animals = { dog, bird };
+        foreach (var animal in animals)
+        {
+            Console.WriteLine($"{animal.Name}");
+        }
+
+    }
+    public void Test(object obj)
+    {
+        // as 연산자
+        MyBase a = obj as MyBase;
+
+        // is 연산자
+        bool ok = obj is MyBase; //true
+
+        // Explicit Casting
+        MyBase b = (MyBase)obj;
+    }
+
+}

ExN.Static/ExN.Static.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExN.Static/Program.cs

@@ -0,0 +1,61 @@
+public class MyClass
+{
+    private int val = 1;
+
+    // 인스턴스 메서드
+    public int InstRun()
+    {
+        return val;
+    }
+
+    // 정적(Static) 메서드
+    public static int Run()
+    {
+        return 1;
+    }
+}
+
+public class Client
+{
+    public void Test()
+    {
+        // 인스턴스 메서드 호출
+        MyClass myClass = new MyClass();
+        int i = myClass.InstRun();
+
+        // 정적 메서드 호출
+        int j = MyClass.Run();
+    }
+}
+
+// static 클래스 정의
+public static class MyUtility
+{
+    private static int ver;
+
+    // static 생성자
+    static MyUtility()
+    {
+        ver = 1;
+    }
+
+    public static string Convert(int i)
+    {
+        return i.ToString();
+    }
+
+    public static int ConvertBack(string s)
+    {
+        return int.Parse(s);
+    }
+}
+
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        string str = MyUtility.Convert(123);
+        int i = MyUtility.ConvertBack(str);
+    }
+}

ExO.Generic/ExO.Generic.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExO.Generic/Program.cs

@@ -0,0 +1,58 @@
+class MyStack<T>
+{
+    T[] _elements;
+    int pos = 0;
+
+    public MyStack()
+    {
+        _elements = new T[100];
+    }
+
+    public void Push(T element)
+    {
+        _elements[++pos] = element;
+    }
+
+    public T Pop()
+    {
+        return _elements[pos--];
+    }
+}
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+
+        // 두 개의 서로 다른 타입을 갖는 스택 객체를 생성
+        MyStack<int> numberStack = new MyStack<int>();
+        MyStack<string> nameStack = new MyStack<string>();
+    }
+}
+
+// T는 Value 타입
+class MyClassS<T> where T : struct { }
+
+// T는 Reference 타입
+class MyClassC<T> where T : class { }
+
+// T는 디폴트 생성자를 가져야 함
+class MyClassD<T> where T : new() { }
+
+// T는 EventArgs의 파생클래스이어야 함
+class MyClassMyBase<T> where T : EventArgs { }
+
+// T는 IComparable 인터페이스를 가져야 함
+class MyClass<T> where T : IComparable { }
+
+// 좀 더 복잡한 제약들
+class EmployeeList<T> where T : EventArgs, IDisposable, IComparable<T>, new()
+{
+}
+
+// 복수 타입 파라미터 제약
+class MyClass<T, U>
+    where T : class
+    where U : struct
+{
+}

ExP.Interface/ExP.Interface.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExP.Interface/Program.cs

@@ -0,0 +1,35 @@
+using System.ComponentModel;
+using System.Data;
+
+public class MyConnection : Component, IDbConnection, IDisposable
+{
+    // IDbConnection을 구현
+    // IDisposable을 구현
+}
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        Console.WriteLine("Hello, World!");
+    }
+}
+
+public interface IComparable
+{
+    // 멤버 앞에 접근제한자 사용 안함
+    int CompareTo(object obj);
+}
+
+public class MyClass : IComparable
+{
+    private int key;
+    private int value;
+
+    // IComparable 의 CompareTo 메서드 구현
+    public int CompareTo(object obj)
+    {
+        MyClass target = (MyClass)obj;
+        return this.key.CompareTo(target.key);
+    }
+}

ExQ.Delegate1/ExQ.Delegate1.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExQ.Delegate1/Program.cs

@@ -0,0 +1,34 @@
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        new Program().Test();
+    }
+
+    // 델리게이트 정의
+    delegate int MyDelegate(string s);
+
+    void Test()
+    {
+        //델리게이트 객체 생성
+        MyDelegate m = new MyDelegate(StringToInt);
+
+        //델리게이트 객체를 메서드로 전달
+        Run(m);
+    }
+
+    // 델리게이트 대상이 되는 어떤 메서드
+    int StringToInt(string s)
+    {
+        return int.Parse(s);
+    }
+
+    // 델리게이트를 전달 받는 메서드
+    void Run(MyDelegate m)
+    {
+        // 델리게이트로부터 메서드 실행
+        int i = m("123");
+
+        Console.WriteLine(i);
+    }
+}

Ojt.Lectures.sln

@@ -0,0 +1,175 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35806.99 d17.13
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ex2.Comment", "Ex2.Comment\Ex2.Comment.csproj", "{4FC56CD5-D7C4-41D5-91B9-EC406225A715}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ex1.HelloWorld", "Ex1.HelloWorld\Ex1.HelloWorld.csproj", "{39ABAB47-45AD-4E0C-866F-E12810D1CBFF}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ex3.DataType", "Ex3.DataType\Ex3.DataType.csproj", "{B0DCAEBE-EBCC-4929-8B61-93E5853BA9F6}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ex4.VariableConstant", "Ex4.VariableConstant\Ex4.VariableConstant.csproj", "{AB320A4A-367C-4052-850B-9D79E53A0421}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ex5.Array", "Ex5.Array\Ex5.Array.csproj", "{5CC1E4EB-4C16-4B63-A38E-65E7F13AC08C}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ex6.String", "Ex6.String\Ex6.String.csproj", "{6A2134F4-B4FD-4313-9DDB-EF9E426A96FF}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ex7.Enum", "Ex7.Enum\Ex7.Enum.csproj", "{21FE3B80-B9E9-4406-B304-BEBBEC22B47B}"
+EndProject
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+EndProject
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