统一归档20260319

CS/lab10/10_4/10_4.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>_10_4</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

CS/lab10/10_4/10_4.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36717.8 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "10_4", "10_4.csproj", "{7B5F7831-4A32-4306-A181-F50BAEF293EF}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7B5F7831-4A32-4306-A181-F50BAEF293EF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7B5F7831-4A32-4306-A181-F50BAEF293EF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7B5F7831-4A32-4306-A181-F50BAEF293EF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7B5F7831-4A32-4306-A181-F50BAEF293EF}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {30A7F968-1EBB-479E-AC0B-15B2A30CB02C}
+	EndGlobalSection
+EndGlobal

CS/lab10/10_4/Program.cs

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+namespace _10_4
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            string text = @"The quick brown fox jumps over the lazy dog." +
+                          @"An apple a day keeps the doctor away." +
+                          @"Can a fox and a dog be friends?";
+            Console.WriteLine(text);
+            string searchTerm = "the";
+            string[] source = text.ToLower().Split(new char[] { '.', ' ','!','?','.' }, StringSplitOptions.RemoveEmptyEntries);
+            int wordCount = 0;
+            foreach (string s in source)
+            {
+                if (s.CompareTo(searchTerm)==0)
+                {
+                    wordCount++;
+                }
+            }
+            Console.WriteLine("单词{0}一共出现{1}次，频率{2:#0.##%}",searchTerm,wordCount,wordCount/(double)source.Length);
+        }
+    }
+}