diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000000000000000000000000000000000000..1ff0c423042b46cb1d617b81efb715defbe8054d
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,63 @@
+###############################################################################
+# Set default behavior to automatically normalize line endings.
+###############################################################################
+* text=auto
+
+###############################################################################
+# Set default behavior for command prompt diff.
+#
+# This is need for earlier builds of msysgit that does not have it on by
+# default for csharp files.
+# Note: This is only used by command line
+###############################################################################
+#*.cs diff=csharp
+
+###############################################################################
+# Set the merge driver for project and solution files
+#
+# Merging from the command prompt will add diff markers to the files if there
+# are conflicts (Merging from VS is not affected by the settings below, in VS
+# the diff markers are never inserted). Diff markers may cause the following
+# file extensions to fail to load in VS. An alternative would be to treat
+# these files as binary and thus will always conflict and require user
+# intervention with every merge. To do so, just uncomment the entries below
+###############################################################################
+#*.sln merge=binary
+#*.csproj merge=binary
+#*.vbproj merge=binary
+#*.vcxproj merge=binary
+#*.vcproj merge=binary
+#*.dbproj merge=binary
+#*.fsproj merge=binary
+#*.lsproj merge=binary
+#*.wixproj merge=binary
+#*.modelproj merge=binary
+#*.sqlproj merge=binary
+#*.wwaproj merge=binary
+
+###############################################################################
+# behavior for image files
+#
+# image files are treated as binary by default.
+###############################################################################
+#*.jpg binary
+#*.png binary
+#*.gif binary
+
+###############################################################################
+# diff behavior for common document formats
+#
+# Convert binary document formats to text before diffing them. This feature
+# is only available from the command line. Turn it on by uncommenting the
+# entries below.
+###############################################################################
+#*.doc diff=astextplain
+#*.DOC diff=astextplain
+#*.docx diff=astextplain
+#*.DOCX diff=astextplain
+#*.dot diff=astextplain
+#*.DOT diff=astextplain
+#*.pdf diff=astextplain
+#*.PDF diff=astextplain
+#*.rtf diff=astextplain
+#*.RTF diff=astextplain
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..3c4efe206bd0e7230ad0ae8396a3c883c8207906
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,261 @@
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# DNX
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# TODO: Comment the next line if you want to checkin your web deploy settings
+# but database connection strings (with potential passwords) will be unencrypted
+#*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignoreable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+node_modules/
+orleans.codegen.cs
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+# CodeRush
+.cr/
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
\ No newline at end of file
diff --git a/arithmetic-operations.sln b/arithmetic-operations.sln
new file mode 100644
index 0000000000000000000000000000000000000000..4b9712b9a26d8be39948c8eb535200a9756d73ca
--- /dev/null
+++ b/arithmetic-operations.sln
@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31313.79
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "arithmetic-operations", "arithmetic-operations\arithmetic-operations.vcxproj", "{F7F3A738-DD5B-4BF4-A8E0-B35CD6F47BBC}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|x64 = Debug|x64
+ Debug|x86 = Debug|x86
+ Release|x64 = Release|x64
+ Release|x86 = Release|x86
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {F7F3A738-DD5B-4BF4-A8E0-B35CD6F47BBC}.Debug|x64.ActiveCfg = Debug|x64
+ {F7F3A738-DD5B-4BF4-A8E0-B35CD6F47BBC}.Debug|x64.Build.0 = Debug|x64
+ {F7F3A738-DD5B-4BF4-A8E0-B35CD6F47BBC}.Debug|x86.ActiveCfg = Debug|Win32
+ {F7F3A738-DD5B-4BF4-A8E0-B35CD6F47BBC}.Debug|x86.Build.0 = Debug|Win32
+ {F7F3A738-DD5B-4BF4-A8E0-B35CD6F47BBC}.Release|x64.ActiveCfg = Release|x64
+ {F7F3A738-DD5B-4BF4-A8E0-B35CD6F47BBC}.Release|x64.Build.0 = Release|x64
+ {F7F3A738-DD5B-4BF4-A8E0-B35CD6F47BBC}.Release|x86.ActiveCfg = Release|Win32
+ {F7F3A738-DD5B-4BF4-A8E0-B35CD6F47BBC}.Release|x86.Build.0 = Release|Win32
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+ GlobalSection(ExtensibilityGlobals) = postSolution
+ SolutionGuid = {638C8553-2DB5-4865-945F-72684C761FD7}
+ EndGlobalSection
+EndGlobal
diff --git a/arithmetic-operations/arithmetic-operations.cpp b/arithmetic-operations/arithmetic-operations.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..37d82996cfbb0e829da149429883358f31a7e018
--- /dev/null
+++ b/arithmetic-operations/arithmetic-operations.cpp
@@ -0,0 +1,26 @@
+// arithmetic-operations.cpp : 定义 DLL 的导出函数。
+//
+
+#include "pch.h"
+#include "framework.h"
+#include "arithmetic-operations.h"
+
+
+// 这是导出变量的一个示例
+ARITHMETICOPERATIONS_API int narithmeticoperations=0;
+
+// 这是导出函数的一个示例。
+ARITHMETICOPERATIONS_API int fnarithmeticoperations(void)
+{
+ return 0;
+}
+
+// 这是已导出类的构造函数。
+Carithmeticoperations::Carithmeticoperations()
+{
+ return;
+}
+
+int sum(int a, int b) {
+ return a + b;
+}
diff --git a/arithmetic-operations/arithmetic-operations.h b/arithmetic-operations/arithmetic-operations.h
new file mode 100644
index 0000000000000000000000000000000000000000..301e7d42636a75975b3ba56f6e24721b55ef02a6
--- /dev/null
+++ b/arithmetic-operations/arithmetic-operations.h
@@ -0,0 +1,24 @@
+// 下列 ifdef 块是创建使从 DLL 导出更简单的
+// 宏的标准方法。此 DLL 中的所有文件都是用命令行上定义的 ARITHMETICOPERATIONS_EXPORTS
+// 符号编译的。在使用此 DLL 的
+// 任何项目上不应定义此符号。这样,源文件中包含此文件的任何其他项目都会将
+// ARITHMETICOPERATIONS_API 函数视为是从 DLL 导入的,而此 DLL 则将用此宏定义的
+// 符号视为是被导出的。
+#ifdef ARITHMETICOPERATIONS_EXPORTS
+#define ARITHMETICOPERATIONS_API __declspec(dllexport)
+#else
+#define ARITHMETICOPERATIONS_API __declspec(dllimport)
+#endif
+
+// 此类是从 dll 导出的
+class ARITHMETICOPERATIONS_API Carithmeticoperations {
+public:
+ Carithmeticoperations(void);
+ // TODO: 在此处添加方法。
+};
+
+extern ARITHMETICOPERATIONS_API int narithmeticoperations;
+
+ARITHMETICOPERATIONS_API int fnarithmeticoperations(void);
+
+extern "C" _declspec(dllexport) int sum(int a, int b);
diff --git a/arithmetic-operations/arithmetic-operations.vcxproj b/arithmetic-operations/arithmetic-operations.vcxproj
new file mode 100644
index 0000000000000000000000000000000000000000..d13be2ca6cc3bc4d0476dfd6479f133e7ce8a082
--- /dev/null
+++ b/arithmetic-operations/arithmetic-operations.vcxproj
@@ -0,0 +1,178 @@
+
+
+
+
+ Debug
+ Win32
+
+
+ Release
+ Win32
+
+
+ Debug
+ x64
+
+
+ Release
+ x64
+
+
+
+ 16.0
+ Win32Proj
+ {f7f3a738-dd5b-4bf4-a8e0-b35cd6f47bbc}
+ arithmeticoperations
+ 10.0
+
+
+
+ DynamicLibrary
+ true
+ v142
+ Unicode
+
+
+ DynamicLibrary
+ false
+ v142
+ true
+ Unicode
+
+
+ DynamicLibrary
+ true
+ v142
+ Unicode
+
+
+ DynamicLibrary
+ false
+ v142
+ true
+ Unicode
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ true
+ arithmeticoperations
+
+
+ false
+ arithmeticoperations
+
+
+ true
+ arithmeticoperations
+
+
+ false
+ arithmeticoperations
+
+
+
+ Level3
+ true
+ WIN32;_DEBUG;ARITHMETICOPERATIONS_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)
+ true
+ Use
+ pch.h
+
+
+ Windows
+ true
+ false
+
+
+
+
+ Level3
+ true
+ true
+ true
+ WIN32;NDEBUG;ARITHMETICOPERATIONS_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)
+ true
+ Use
+ pch.h
+
+
+ Windows
+ true
+ true
+ true
+ false
+
+
+
+
+ Level3
+ true
+ _DEBUG;ARITHMETICOPERATIONS_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)
+ true
+ Use
+ pch.h
+
+
+ Windows
+ true
+ false
+
+
+
+
+ Level3
+ true
+ true
+ true
+ NDEBUG;ARITHMETICOPERATIONS_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)
+ true
+ Use
+ pch.h
+
+
+ Windows
+ true
+ true
+ true
+ false
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Create
+ Create
+ Create
+ Create
+
+
+
+
+
+
\ No newline at end of file
diff --git a/arithmetic-operations/arithmetic-operations.vcxproj.filters b/arithmetic-operations/arithmetic-operations.vcxproj.filters
new file mode 100644
index 0000000000000000000000000000000000000000..81f1ada6670188fac28ce9d0823ae08817afe647
--- /dev/null
+++ b/arithmetic-operations/arithmetic-operations.vcxproj.filters
@@ -0,0 +1,42 @@
+
+
+
+
+ {4FC737F1-C7A5-4376-A066-2A32D752A2FF}
+ cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx
+
+
+ {93995380-89BD-4b04-88EB-625FBE52EBFB}
+ h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd
+
+
+ {67DA6AB6-F800-4c08-8B7A-83BB121AAD01}
+ rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms
+
+
+
+
+
+
+
+ 头文件
+
+
+ 头文件
+
+
+ 头文件
+
+
+
+
+ 源文件
+
+
+ 源文件
+
+
+ 源文件
+
+
+
\ No newline at end of file
diff --git a/arithmetic-operations/cpp.hint b/arithmetic-operations/cpp.hint
new file mode 100644
index 0000000000000000000000000000000000000000..a0516c0deee65432ec0a61d0e305af4171f944e4
--- /dev/null
+++ b/arithmetic-operations/cpp.hint
@@ -0,0 +1,2 @@
+#define ARITHMETICOPERATIONS_API __declspec(dllexport)
+#define ARITHMETICOPERATIONS_API __declspec(dllimport)
diff --git a/arithmetic-operations/dllmain.cpp b/arithmetic-operations/dllmain.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..daed8c8f7ac50ca1466016a0529648d18125a7e7
--- /dev/null
+++ b/arithmetic-operations/dllmain.cpp
@@ -0,0 +1,19 @@
+// dllmain.cpp : 定义 DLL 应用程序的入口点。
+#include "pch.h"
+
+BOOL APIENTRY DllMain( HMODULE hModule,
+ DWORD ul_reason_for_call,
+ LPVOID lpReserved
+ )
+{
+ switch (ul_reason_for_call)
+ {
+ case DLL_PROCESS_ATTACH:
+ case DLL_THREAD_ATTACH:
+ case DLL_THREAD_DETACH:
+ case DLL_PROCESS_DETACH:
+ break;
+ }
+ return TRUE;
+}
+
diff --git a/arithmetic-operations/framework.h b/arithmetic-operations/framework.h
new file mode 100644
index 0000000000000000000000000000000000000000..80cbbc9b06a9b0141f92ee19eceaed71328caff4
--- /dev/null
+++ b/arithmetic-operations/framework.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#define WIN32_LEAN_AND_MEAN // 从 Windows 头文件中排除极少使用的内容
+// Windows 头文件
+#include
diff --git a/arithmetic-operations/pch.cpp b/arithmetic-operations/pch.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b6fb8f4ab8139ad5173d9cb41220b4ec991ae9e8
--- /dev/null
+++ b/arithmetic-operations/pch.cpp
@@ -0,0 +1,5 @@
+// pch.cpp: 与预编译标头对应的源文件
+
+#include "pch.h"
+
+// 当使用预编译的头时,需要使用此源文件,编译才能成功。
diff --git a/arithmetic-operations/pch.h b/arithmetic-operations/pch.h
new file mode 100644
index 0000000000000000000000000000000000000000..966092717e1dd88467dc6cbe6792c0e89e7397c0
--- /dev/null
+++ b/arithmetic-operations/pch.h
@@ -0,0 +1,13 @@
+// pch.h: 这是预编译标头文件。
+// 下方列出的文件仅编译一次,提高了将来生成的生成性能。
+// 这还将影响 IntelliSense 性能,包括代码完成和许多代码浏览功能。
+// 但是,如果此处列出的文件中的任何一个在生成之间有更新,它们全部都将被重新编译。
+// 请勿在此处添加要频繁更新的文件,这将使得性能优势无效。
+
+#ifndef PCH_H
+#define PCH_H
+
+// 添加要在此处预编译的标头
+#include "framework.h"
+
+#endif //PCH_H