diff --git a/Ch0-Lab-4/.vs/Ch0-Lab-4/v16/.suo b/Ch0-Lab-4/.vs/Ch0-Lab-4/v16/.suo
new file mode 100644
index 0000000..f4798f9
Binary files /dev/null and b/Ch0-Lab-4/.vs/Ch0-Lab-4/v16/.suo differ
diff --git a/Ch0-Lab-4/.vs/Ch0-Lab-4/v16/Browse.VC.db b/Ch0-Lab-4/.vs/Ch0-Lab-4/v16/Browse.VC.db
new file mode 100644
index 0000000..66a74e2
Binary files /dev/null and b/Ch0-Lab-4/.vs/Ch0-Lab-4/v16/Browse.VC.db differ
diff --git a/Ch0-Lab-4/.vs/Ch0-Lab-4/v16/ipch/AutoPCH/21a6145f9e88ffda/MAIN.ipch b/Ch0-Lab-4/.vs/Ch0-Lab-4/v16/ipch/AutoPCH/21a6145f9e88ffda/MAIN.ipch
new file mode 100644
index 0000000..8a4ab38
Binary files /dev/null and b/Ch0-Lab-4/.vs/Ch0-Lab-4/v16/ipch/AutoPCH/21a6145f9e88ffda/MAIN.ipch differ
diff --git a/Ch0-Lab-4/Ch0-Lab-4.sln b/Ch0-Lab-4/Ch0-Lab-4.sln
new file mode 100644
index 0000000..4081d65
--- /dev/null
+++ b/Ch0-Lab-4/Ch0-Lab-4.sln
@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29306.81
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Ch0-Lab-4", "Ch0-Lab-4\Ch0-Lab-4.vcxproj", "{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}"
+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
+		{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}.Debug|x64.ActiveCfg = Debug|x64
+		{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}.Debug|x64.Build.0 = Debug|x64
+		{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}.Debug|x86.ActiveCfg = Debug|Win32
+		{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}.Debug|x86.Build.0 = Debug|Win32
+		{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}.Release|x64.ActiveCfg = Release|x64
+		{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}.Release|x64.Build.0 = Release|x64
+		{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}.Release|x86.ActiveCfg = Release|Win32
+		{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A8CB5AD7-5576-4A96-ABBD-3663C5C18AA9}
+	EndGlobalSection
+EndGlobal
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Ch0-Lab-4.vcxproj b/Ch0-Lab-4/Ch0-Lab-4/Ch0-Lab-4.vcxproj
new file mode 100644
index 0000000..e7b48fc
--- /dev/null
+++ b/Ch0-Lab-4/Ch0-Lab-4/Ch0-Lab-4.vcxproj
@@ -0,0 +1,131 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>16.0</VCProjectVersion>
+    <ProjectGuid>{D34A9B47-061A-40AE-85C2-A7C7C2CC6D25}</ProjectGuid>
+    <RootNamespace>Ch0Lab4</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup />
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\source\main.c" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Ch0-Lab-4.vcxproj.filters b/Ch0-Lab-4/Ch0-Lab-4/Ch0-Lab-4.vcxproj.filters
new file mode 100644
index 0000000..be2c236
--- /dev/null
+++ b/Ch0-Lab-4/Ch0-Lab-4/Ch0-Lab-4.vcxproj.filters
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="source">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="include">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;ipp;xsd</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\source\main.c">
+      <Filter>source</Filter>
+    </ClCompile>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Ch0-Lab-4.vcxproj.user b/Ch0-Lab-4/Ch0-Lab-4/Ch0-Lab-4.vcxproj.user
new file mode 100644
index 0000000..88a5509
--- /dev/null
+++ b/Ch0-Lab-4/Ch0-Lab-4/Ch0-Lab-4.vcxproj.user
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+</Project>
\ No newline at end of file
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.log b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.log
new file mode 100644
index 0000000..af65e86
--- /dev/null
+++ b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.log
@@ -0,0 +1,2 @@
+  main.c
+  Ch0-Lab-4.vcxproj -> C:\Users\user\Desktop\106-Ch0-Lab4\Ch0-Lab-4\Debug\Ch0-Lab-4.exe
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/CL.command.1.tlog b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/CL.command.1.tlog
new file mode 100644
index 0000000..1487dbe
Binary files /dev/null and b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/CL.command.1.tlog differ
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/CL.read.1.tlog b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/CL.read.1.tlog
new file mode 100644
index 0000000..03b9a11
Binary files /dev/null and b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/CL.read.1.tlog differ
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/CL.write.1.tlog b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/CL.write.1.tlog
new file mode 100644
index 0000000..c3b6ab7
Binary files /dev/null and b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/CL.write.1.tlog differ
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/Ch0-Lab-4.lastbuildstate b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/Ch0-Lab-4.lastbuildstate
new file mode 100644
index 0000000..dc59bc6
--- /dev/null
+++ b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/Ch0-Lab-4.lastbuildstate
@@ -0,0 +1,2 @@
+#TargetFrameworkVersion=v4.0:PlatformToolSet=v142:EnableManagedIncrementalBuild=false:VCToolArchitecture=Native32Bit:WindowsTargetPlatformVersion=10.0
+Debug|Win32|C:\Users\user\Desktop\106-Ch0-Lab4\Ch0-Lab-4\|
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/link.command.1.tlog b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/link.command.1.tlog
new file mode 100644
index 0000000..b5d70df
Binary files /dev/null and b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/link.command.1.tlog differ
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/link.read.1.tlog b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/link.read.1.tlog
new file mode 100644
index 0000000..f242c6c
Binary files /dev/null and b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/link.read.1.tlog differ
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/link.write.1.tlog b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/link.write.1.tlog
new file mode 100644
index 0000000..c08f715
Binary files /dev/null and b/Ch0-Lab-4/Ch0-Lab-4/Debug/Ch0-Lab-4.tlog/link.write.1.tlog differ
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/main.obj b/Ch0-Lab-4/Ch0-Lab-4/Debug/main.obj
new file mode 100644
index 0000000..2c16045
Binary files /dev/null and b/Ch0-Lab-4/Ch0-Lab-4/Debug/main.obj differ
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/vc142.idb b/Ch0-Lab-4/Ch0-Lab-4/Debug/vc142.idb
new file mode 100644
index 0000000..3ecce1e
Binary files /dev/null and b/Ch0-Lab-4/Ch0-Lab-4/Debug/vc142.idb differ
diff --git a/Ch0-Lab-4/Ch0-Lab-4/Debug/vc142.pdb b/Ch0-Lab-4/Ch0-Lab-4/Debug/vc142.pdb
new file mode 100644
index 0000000..bf80a58
Binary files /dev/null and b/Ch0-Lab-4/Ch0-Lab-4/Debug/vc142.pdb differ
diff --git a/Ch0-Lab-4/Debug/Ch0-Lab-4.exe b/Ch0-Lab-4/Debug/Ch0-Lab-4.exe
new file mode 100644
index 0000000..2f3084b
Binary files /dev/null and b/Ch0-Lab-4/Debug/Ch0-Lab-4.exe differ
diff --git a/Ch0-Lab-4/Debug/Ch0-Lab-4.ilk b/Ch0-Lab-4/Debug/Ch0-Lab-4.ilk
new file mode 100644
index 0000000..97fd067
Binary files /dev/null and b/Ch0-Lab-4/Debug/Ch0-Lab-4.ilk differ
diff --git a/Ch0-Lab-4/Debug/Ch0-Lab-4.pdb b/Ch0-Lab-4/Debug/Ch0-Lab-4.pdb
new file mode 100644
index 0000000..df47fef
Binary files /dev/null and b/Ch0-Lab-4/Debug/Ch0-Lab-4.pdb differ