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new file mode 100644
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+EndProject
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+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
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+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{78126EE3-DCD8-4B6A-8935-896C594BF043}.Debug|x64.ActiveCfg = Debug|x64
+		{78126EE3-DCD8-4B6A-8935-896C594BF043}.Debug|x64.Build.0 = Debug|x64
+		{78126EE3-DCD8-4B6A-8935-896C594BF043}.Debug|x86.ActiveCfg = Debug|Win32
+		{78126EE3-DCD8-4B6A-8935-896C594BF043}.Debug|x86.Build.0 = Debug|Win32
+		{78126EE3-DCD8-4B6A-8935-896C594BF043}.Release|x64.ActiveCfg = Release|x64
+		{78126EE3-DCD8-4B6A-8935-896C594BF043}.Release|x64.Build.0 = Release|x64
+		{78126EE3-DCD8-4B6A-8935-896C594BF043}.Release|x86.ActiveCfg = Release|Win32
+		{78126EE3-DCD8-4B6A-8935-896C594BF043}.Release|x86.Build.0 = Release|Win32
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new file mode 100644
index 0000000..76b14dd
--- /dev/null
+++ b/ch0-lab4/ch0-lab4/ch0-lab4.vcxproj
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+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
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+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
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+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
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+    <CharacterSet>MultiByte</CharacterSet>
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
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+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
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+  <PropertyGroup Label="UserMacros" />
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+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
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+      <SDLCheck>true</SDLCheck>
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+      <Optimization>Disabled</Optimization>
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+      <ConformanceMode>true</ConformanceMode>
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+    <Link>
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+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
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+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
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+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
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+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
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+    <Link>
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+      <OptimizeReferences>true</OptimizeReferences>
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+    <ClCompile Include="..\..\source\main.c" />
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+</Project>
\ No newline at end of file
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new file mode 100644
index 0000000..be2c236
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@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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new file mode 100644
index 0000000..88a5509
--- /dev/null
+++ b/ch0-lab4/ch0-lab4/ch0-lab4.vcxproj.user
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
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\ No newline at end of file