Synchronization of old projects

Part1

C#入门/Lesson13_逻辑运算符练习/Lesson13_逻辑运算符练习.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>

C#入门/Lesson13_逻辑运算符练习/Program.cs

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+using System;
+namespace Lesson13
+{
+    class program
+    {
+        static void Main(string[] args)
+        {
+            #region 练习题一
+            //求打印结果
+            //Console.WriteLine(true || true); true
+            //Console.WriteLine(false || true); true
+            //Console.WriteLine(true && true); true
+            //Console.WriteLine(true && false); false
+            //Console.WriteLine(!true);false
+            #endregion
+
+            #region 练习题二
+            //求打印结果
+            bool gameOver;
+            bool isWin;
+            int health = 100;
+            gameOver = true;
+            isWin = false;
+            Console.WriteLine(gameOver || isWin && health > 0);//true
+        }
+    }
+}