diff --git a/day2/homework/h1.cpp b/day2/homework/h1.cpp
new file mode 100644
index 0000000..7d41b0a
--- /dev/null
+++ b/day2/homework/h1.cpp
@@ -0,0 +1,13 @@
+// 找错
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    const int n = 10;
+    const int &p = n;
+    // p++; // 错误，不能修改常量引用所引用的值
+    cout << "n=" << n << endl;
+    return 0;
+}
diff --git a/day2/homework/h2.cpp b/day2/homework/h2.cpp
new file mode 100644
index 0000000..2e41628
--- /dev/null
+++ b/day2/homework/h2.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+
+using namespace std;
+
+int func1(int a, int, int b = 20)
+{
+    return a + b;
+}
+
+int main()
+{
+    cout << func1(10, 30) << endl;
+    cout << func1(10, 10, 100) << endl;
+}
\ No newline at end of file
diff --git a/day2/homework/h3.cpp b/day2/homework/h3.cpp
new file mode 100644
index 0000000..82c08d1
--- /dev/null
+++ b/day2/homework/h3.cpp
@@ -0,0 +1,21 @@
+// 1. 2. 创建一个名为 Rectangle 的类，具有成员变量 width 和 height，以及成员函数 double calculateArea() ，用于计算矩形的面积。
+#include <iostream>
+
+using namespace std;
+
+class Rectangle
+{
+public:
+    double calculateArea()
+    {
+        return width * height;
+    }
+
+    int width, height;
+};
+
+int main()
+{
+
+    return 0;
+}
diff --git a/day2/homework/h4.cpp b/day2/homework/h4.cpp
new file mode 100644
index 0000000..b94cd93
--- /dev/null
+++ b/day2/homework/h4.cpp
@@ -0,0 +1,20 @@
+// 1. 2. 创建一个名为 Circle 的类，具有成员变量 radius 和 pi（圆周率），以及成员函数 double calculateArea() ，用于计算圆的面积。
+#include <iostream>
+
+using namespace std;
+
+class Circle
+{
+public:
+    double radius, pi = 3.1415926;
+    double calculateArea()
+    {
+        return pi * radius * radius;
+    }
+};
+
+int main()
+{
+
+    return 0;
+}
diff --git a/day2/homework/h5.cpp b/day2/homework/h5.cpp
new file mode 100644
index 0000000..fa2f5b4
--- /dev/null
+++ b/day2/homework/h5.cpp
@@ -0,0 +1,24 @@
+// 1. 2. 创建一个名为 BankAccount 的类，具有成员变量 accountNumber 和 balance，以及成员函数 void deposit(double amount) 和 void withdraw(double amount) ，用于存款和取款操作。
+#include <iostream>
+
+using namespace std;
+
+class BankAccount
+{
+public:
+    long accountNumber, balance;
+    void deposit(double amount)
+    {
+        this->balance += amount;
+    }
+    void withdraw(double amount)
+    {
+        this->balance -= amount;
+    }
+};
+
+int main()
+{
+
+    return 0;
+}
diff --git a/day2/homework/h6.cpp b/day2/homework/h6.cpp
new file mode 100644
index 0000000..3c2896b
--- /dev/null
+++ b/day2/homework/h6.cpp
@@ -0,0 +1,21 @@
+// 创建一个名为 Student 的类，具有成员变量 name 和 grade，以及成员函数 void study(char *course) ，用于表示某班级的某学生正在学习某一门课程。
+#include <iostream>
+
+using namespace std;
+
+class Student
+{
+public:
+    char name[32];  // 学生姓名
+    char grade[32]; // 班级名
+    void study(char *course)
+    {
+        cout << this->grade << "班的" << this->name << "同学正在学习" << course << endl;
+    }
+};
+
+int main()
+{
+
+    return 0;
+}
diff --git a/day2/homework/h7.cpp b/day2/homework/h7.cpp
new file mode 100644
index 0000000..c77af19
--- /dev/null
+++ b/day2/homework/h7.cpp
@@ -0,0 +1,35 @@
+// 创建一个名为 Car 的类，具有成员变量 brand 和 speed，以及成员函数 void accelerate() 和 void brake() ，用于加速和刹车操作。
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+class Car
+{
+public:
+    string brand;
+    int speed;
+    void accelerate()
+    {
+        this->speed += 1;
+        cout << "加速 1 码" << endl;
+    }
+    void brake()
+    {
+        if (this->speed > 0)
+        {
+            this->speed -= 1;
+            cout << "减速中" << endl;
+        }
+        else
+        {
+            cout << "车已经停下了" << endl;
+        }
+    }
+};
+
+int main()
+{
+
+    return 0;
+}
diff --git a/day2/homework/h8.cpp b/day2/homework/h8.cpp
new file mode 100644
index 0000000..29a7f68
--- /dev/null
+++ b/day2/homework/h8.cpp
@@ -0,0 +1,22 @@
+// 1. 2. 创建一个名为 Employee 的类，具有成员变量 name、id 和 salary，以及成员函数 void displayInfo() ，用于显示员工的信息。
+#include <iostream>
+
+using namespace std;
+
+class Employee
+{
+public:
+    string name;
+    int id;
+    int salary;
+    void displayinfo()
+    {
+        cout << "员工信息\nid: " << this->id << "\t姓名: " << this->name << "\t薪水: " << this->salary << endl;
+    }
+};
+
+int main()
+{
+
+    return 0;
+}
diff --git a/day2/homework/h9.cpp b/day2/homework/h9.cpp
new file mode 100644
index 0000000..32e1329
--- /dev/null
+++ b/day2/homework/h9.cpp
@@ -0,0 +1,58 @@
+// 创建一个名为 Book 的类，具有成员变量 title、author 和 year，以及成员函数 void displayInfo() ，用于显示图书的信息。 创建Book类的数组，至少存放5本书，并设计全局函数，实现Book对象按year从大到小排序，并显示排序后信息。
+#include <iostream>
+
+using namespace std;
+
+class Book
+{
+public:
+    string title, author;
+    int year;
+    // 使用 const 加 & 引用，避免不必要的拷贝
+    void init(const string &title, const string &author, int year)
+    {
+        this->title = title;
+        this->author = author;
+        this->year = year;
+    }
+    void displayinfo()
+    {
+        cout << "书名: " << this->title << " , 作者: " << this->author << " , 出版年份: " << this->year << endl;
+    }
+};
+
+void sortAndShow(Book book[], int n)
+{
+    int i = 0;
+    for (; i < n; i++)
+    {
+        for (int j = 0; j < n - i - 1; j++)
+        {
+            if (book[j].year < book[j + 1].year)
+            {
+                Book tmp = book[j];
+                book[j] = book[j + 1];
+                book[j + 1] = tmp;
+            }
+        }
+    }
+
+    for (i = 0; i < n; i++)
+    {
+        book[i].displayinfo();
+    }
+}
+
+int main()
+{
+    Book books[5];
+    books[0].init("数学", "张三", 1998);
+    books[1].init("语文", "李四", 2009);
+    books[2].init("英语", "王五", 1987);
+    books[3].init("物理", "赵六", 2008);
+    books[4].init("化学", "郑七", 1982);
+
+    sortAndShow(books, 5);
+
+    return 0;
+}