diff --git a/day1/homework/h3.cpp b/day1/homework/h3.cpp
new file mode 100644
index 0000000..7be08f1
--- /dev/null
+++ b/day1/homework/h3.cpp
@@ -0,0 +1,34 @@
+#include <iostream>
+
+using namespace std;
+
+namespace Circle
+{
+    float r;
+    float s();
+}
+
+float Circle::s()
+{
+    return 3.14 * r * r;
+}
+
+namespace Range
+{
+    int w, h;
+    int s();
+}
+
+int Range::s()
+{
+    return w * h;
+}
+
+int main()
+{
+    cout << "输入半径:";
+    cin >> Circle::r;
+    float s1 = Circle::s();
+    cout << "面积: " << s1;
+    return 0;
+}
\ No newline at end of file
diff --git a/day1/homework/h4.cpp b/day1/homework/h4.cpp
new file mode 100644
index 0000000..60c584d
--- /dev/null
+++ b/day1/homework/h4.cpp
@@ -0,0 +1,40 @@
+#include <iostream>
+#include <cstdlib>
+#include <cstring>
+
+using namespace std;
+
+typedef struct file_node_s
+{
+    char filename[32];
+    int filesize;
+
+    file_node_s *next;
+} FileNode;
+
+int main()
+{
+    FileNode *head = NULL;
+    FileNode *fn1 = (FileNode *)malloc(sizeof(FileNode));
+    strcpy(fn1->filename, "数学");
+    fn1->filesize = 1000;
+    FileNode *fn2 = (FileNode *)malloc(sizeof(FileNode));
+    strcpy(fn2->filename, "语文");
+    fn2->filesize = 1200;
+    FileNode *fn3 = (FileNode *)malloc(sizeof(FileNode));
+    strcpy(fn3->filename, "英语");
+    fn3->filesize = 1150;
+    head = fn1;
+    fn1->next = fn3;
+    fn3->next = fn2;
+    fn2->next = NULL;
+
+    FileNode *p = head;
+    while (p != NULL)
+    {
+        cout << "文件名: " << p->filename << ", 文件大小: " << p->filesize << endl;
+        p = p->next;
+    }
+
+    return 0;
+}
diff --git a/day1/homework/h5.cpp b/day1/homework/h5.cpp
new file mode 100644
index 0000000..bd3bf5e
--- /dev/null
+++ b/day1/homework/h5.cpp
@@ -0,0 +1,24 @@
+#include <iostream>
+#include <cmath>
+
+using namespace std;
+const float PI = 3.14159;
+
+double Area(double a, double b)
+{
+    return PI * pow(a, 2) * b / 360;
+}
+double Area(double a)
+{
+    return PI * pow(a, 2);
+}
+
+int main(int argc, char const *argv[])
+{
+    double r, x;
+    cout << "请输入半径和角度: " << endl;
+    cin >> r >> x;
+    cout << "半径为 " << r << ", 角度为 " << x << " 的扇形面积为: " << Area(r, x) << endl;
+    cout << "半径为 " << r << ", 的圆的面积为: " << Area(r) << endl;
+    return 0;
+}
\ No newline at end of file