添加Lesson14和Lesson15

2025-09-10 14:43:03 +08:00
parent 4a47573851
commit 8dcaa99ff4
9 changed files with 378 additions and 0 deletions
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Lesson15_继承_万物之父和装箱拆箱练习</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
@@ -0,0 +1,19 @@
+namespace Lesson15_继承_万物之父和装箱拆箱练习
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello, World!");
+            //用代码演示拆箱装箱
+
+            //装箱
+            int i = 10;
+            object o1 = i;
+
+            //拆箱
+            object o2 = o1;
+            int i2 = (int)o2;
+        }
+    }
+}