초기 커밋.

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
+    }
+}