diff --git a/CPP_Learn/CPP_Learn.cpp b/CPP_Learn/CPP_Learn.cpp
index 972d1cd..e92cc86 100644
--- a/CPP_Learn/CPP_Learn.cpp
+++ b/CPP_Learn/CPP_Learn.cpp
@@ -1,6 +1,6 @@
 #include <iostream>
 
-int main()
-{
-    std::cout << "Hello World!\n";
-}
\ No newline at end of file
+//int main()
+//{
+//    std::cout << "Hello World!\n";
+//}
\ No newline at end of file
diff --git a/CPP_Learn/CPP_Learn.vcxproj b/CPP_Learn/CPP_Learn.vcxproj
index 0a1010e..4a7d454 100644
--- a/CPP_Learn/CPP_Learn.vcxproj
+++ b/CPP_Learn/CPP_Learn.vcxproj
@@ -128,6 +128,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="CPP_Learn.cpp" />
+    <ClCompile Include="MemoryAlignment.cpp" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
diff --git a/CPP_Learn/CPP_Learn.vcxproj.filters b/CPP_Learn/CPP_Learn.vcxproj.filters
index 4ac21f0..0edc224 100644
--- a/CPP_Learn/CPP_Learn.vcxproj.filters
+++ b/CPP_Learn/CPP_Learn.vcxproj.filters
@@ -18,5 +18,8 @@
     <ClCompile Include="CPP_Learn.cpp">
       <Filter>源文件</Filter>
     </ClCompile>
+    <ClCompile Include="MemoryAlignment.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/CPP_Learn/MemoryAlignment.cpp b/CPP_Learn/MemoryAlignment.cpp
new file mode 100644
index 0000000..9163892
--- /dev/null
+++ b/CPP_Learn/MemoryAlignment.cpp
@@ -0,0 +1,76 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+typedef struct {
+	int a;
+	int* p;
+	char c;
+	short s;
+	double d;
+	bool b;
+	short sArr[4];
+}struct1;
+
+typedef struct {
+	short sh;
+	struct1 s1;
+	char c;
+}struct2;
+
+typedef struct {
+	char c;
+	vector<int> vec;
+	short s;
+}struct3;
+
+void test() {
+	int i = 10;
+	struct1 s1 = {
+		1234,
+		&i,
+		'c',
+		123,
+		123.4,
+		true,
+		{1, 2, 3, 4}
+	};
+
+	cout << "size of struct1 : " << sizeof(s1) << endl;
+	cout << "offset of a : " << offsetof(struct1, a) << endl;
+	cout << "offset of p : " << offsetof(struct1, p) << endl;
+	cout << "offset of c : " << offsetof(struct1, c) << endl;
+	cout << "offset of s : " << offsetof(struct1, s) << endl;
+	cout << "offset of d : " << offsetof(struct1, d) << endl;
+	cout << "offset of b : " << offsetof(struct1, b) << endl;
+	cout << "offset of sArr : " << offsetof(struct1, sArr) << endl;
+	cout << "--------------" << endl << endl;
+
+	struct2 s2;
+	s2.sh = 42;
+	s2.c = 'f';
+
+	cout << "size of struct2 : " << sizeof(s2) << endl;
+	cout << "offset of s1 : " << offsetof(struct2, s1) << endl;
+	cout << "offset of c : " << offsetof(struct2, c) << endl;
+	cout << "--------------" << endl << endl;
+
+	struct3 s3;
+	s3.c = 'A';
+	s3.s = 678;
+	cout << "size of struct3 : " << sizeof(s3) << endl;
+	cout << "offset of c : " << offsetof(struct3, c) << endl;
+	cout << "offset of vec : " << offsetof(struct3, vec) << endl;
+	cout << "offset of s : " << offsetof(struct3, s) << endl;
+	cout << "--------------" << endl << endl;
+
+	for (int j = 0; j < 100; j++) {
+		s3.vec.push_back(j + 1);
+	}
+
+	cout << "done" << endl;
+}
+
+int main() {
+	test();
+}
\ No newline at end of file
diff --git a/CPP_Learn/x64/Debug/CPP_Learn.ilk b/CPP_Learn/x64/Debug/CPP_Learn.ilk
index 6e8f09f..85123d3 100644
Binary files a/CPP_Learn/x64/Debug/CPP_Learn.ilk and b/CPP_Learn/x64/Debug/CPP_Learn.ilk differ
diff --git a/CPP_Learn/x64/Debug/CPP_Learn.log b/CPP_Learn/x64/Debug/CPP_Learn.log
index 1db99e4..c2bd97b 100644
--- a/CPP_Learn/x64/Debug/CPP_Learn.log
+++ b/CPP_Learn/x64/Debug/CPP_Learn.log
@@ -1,2 +1,2 @@
-  CPP_Learn.cpp
+  MemoryAlignment.cpp
   CPP_Learn.vcxproj -> E:\22020100011_LXB\Projects\VisualStudio\CPP_Learn\x64\Debug\CPP_Learn.exe
diff --git a/CPP_Learn/x64/Debug/CPP_Learn.tlog/CL.command.1.tlog b/CPP_Learn/x64/Debug/CPP_Learn.tlog/CL.command.1.tlog
index d3c17ae..976e537 100644
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diff --git a/CPP_Learn/x64/Debug/CPP_Learn.tlog/CL.read.1.tlog b/CPP_Learn/x64/Debug/CPP_Learn.tlog/CL.read.1.tlog
index d9fc173..c771408 100644
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diff --git a/CPP_Learn/x64/Debug/CPP_Learn.tlog/CL.write.1.tlog b/CPP_Learn/x64/Debug/CPP_Learn.tlog/CL.write.1.tlog
index a1d418f..2c091ee 100644
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diff --git a/CPP_Learn/x64/Debug/CPP_Learn.tlog/link.write.1.tlog b/CPP_Learn/x64/Debug/CPP_Learn.tlog/link.write.1.tlog
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index cf27fb0..9c4880b 100644
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index 3e388eb..a471e80 100644
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