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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;