diff --git a/.gitignore b/.gitignore
index ccb5e1b1e..52026b066 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,8 +5,8 @@
 .vscode/
 .idea/
 cmake-build-debug/
-CMakeLists.txt
 hello-algo.iml
+*.dSYM/
 
 # mkdocs files
 site/
diff --git a/codes/c/CMakeLists.txt b/codes/c/CMakeLists.txt
new file mode 100644
index 000000000..dc9e56af3
--- /dev/null
+++ b/codes/c/CMakeLists.txt
@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.10)
+project(hello_algo C)
+
+set(CMAKE_C_STANDARD 11)
+
+include_directories(./include)
+
+add_subdirectory(include)
+add_subdirectory(chapter_computational_complexity)
+add_subdirectory(chapter_array_and_linkedlist)
+add_subdirectory(chapter_sorting)
diff --git a/codes/c/chapter_array_and_linkedlist/CMakeLists.txt b/codes/c/chapter_array_and_linkedlist/CMakeLists.txt
new file mode 100644
index 000000000..24658b301
--- /dev/null
+++ b/codes/c/chapter_array_and_linkedlist/CMakeLists.txt
@@ -0,0 +1 @@
+add_executable(array array.c)
\ No newline at end of file
diff --git a/codes/c/chapter_array_and_linkedlist/array.c b/codes/c/chapter_array_and_linkedlist/array.c
index 33dc99903..11fcb67f9 100644
--- a/codes/c/chapter_array_and_linkedlist/array.c
+++ b/codes/c/chapter_array_and_linkedlist/array.c
@@ -74,11 +74,11 @@ int main() {
     int size = 5;
     int arr[5];
     printf("数组 arr = ");
-    printArray(arr, size);
+    PrintArray(arr, size);
 
     int nums[5] = { 1, 3, 2, 5, 4 };
     printf("数组 nums = ");
-    printArray(nums, size);
+    PrintArray(nums, size);
     
     /* 随机访问 */
     int randomNum = randomAccess(nums, size);
@@ -89,17 +89,17 @@ int main() {
     int* res = extend(nums, size, enlarge);
     size += enlarge;
     printf("将数组长度扩展至 8 ，得到 nums = ");
-    printArray(res, size);
+    PrintArray(res, size);
     
     /* 插入元素 */
     insert(res, size, 6, 3);
     printf("在索引 3 处插入数字 6 ，得到 nums = ");
-    printArray(res, size);
+    PrintArray(res, size);
 
     /* 删除元素 */
     removeItem(res, size, 2);
     printf("删除索引 2 处的元素，得到 nums = ");
-    printArray(res, size);
+    PrintArray(res, size);
     
     /* 遍历数组 */
     traverse(res, size);
diff --git a/codes/c/chapter_computational_complexity/CMakeLists.txt b/codes/c/chapter_computational_complexity/CMakeLists.txt
new file mode 100644
index 000000000..d9e55dcf1
--- /dev/null
+++ b/codes/c/chapter_computational_complexity/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_executable(time_complexity time_complexity.c )
+add_executable(worst_best_time_complexity worst_best_time_complexity.c)
\ No newline at end of file
diff --git a/codes/c/chapter_computational_complexity/worst_best_time_complexity.c b/codes/c/chapter_computational_complexity/worst_best_time_complexity.c
index 2570ff3c3..531a76e51 100644
--- a/codes/c/chapter_computational_complexity/worst_best_time_complexity.c
+++ b/codes/c/chapter_computational_complexity/worst_best_time_complexity.c
@@ -41,7 +41,7 @@ int main(int argc, char *argv[]) {
         int *nums = randomNumbers(n);
         int index = findOne(nums, n);
         printf("\n数组 [ 1, 2, ..., n ] 被打乱后 = ");
-        printArray(nums, n);
+        PrintArray(nums, n);
         printf("数字 1 的索引为 %d\n", index);
         // 释放堆区内存
         if (nums != NULL) {
@@ -49,6 +49,5 @@ int main(int argc, char *argv[]) {
             nums = NULL;
         }
     }
-    getchar();
     return 0;
 }
diff --git a/codes/c/chapter_sorting/CMakeLists.txt b/codes/c/chapter_sorting/CMakeLists.txt
new file mode 100644
index 000000000..192e1cb97
--- /dev/null
+++ b/codes/c/chapter_sorting/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_executable(bubble_sort bubble_sort.c)
+add_executable(insertion_sort insertion_sort.c)
\ No newline at end of file
diff --git a/codes/c/chapter_sorting/bubble_sort.c b/codes/c/chapter_sorting/bubble_sort.c
index 5c74d9e4e..4a2a24b44 100644
--- a/codes/c/chapter_sorting/bubble_sort.c
+++ b/codes/c/chapter_sorting/bubble_sort.c
@@ -50,14 +50,14 @@ void bubble_sort_with_flag(int nums[], int size) {
 /* Driver Code */
 int main() {
     int nums[6] = {4, 1, 3, 1, 5, 2};
-    printf("冒泡排序后:\n");
+    printf("冒泡排序后: ");
     bubble_sort(nums, 6);
     for (int i = 0; i < 6; i++)
     {
         printf("%d ", nums[i]);
     }
 
-    printf("优化版冒泡排序后:\n");
+    printf("\n优化版冒泡排序后: ");
     bubble_sort_with_flag(nums, 6);
     for (int i = 0; i < 6; i++)
     {
diff --git a/codes/c/chapter_sorting/insertion_sort.c b/codes/c/chapter_sorting/insertion_sort.c
index 80e8b127b..f81b8d43e 100644
--- a/codes/c/chapter_sorting/insertion_sort.c
+++ b/codes/c/chapter_sorting/insertion_sort.c
@@ -28,7 +28,7 @@ void insertionSort(int nums[], int size) {
 int main() {
     int nums[] = {4, 1, 3, 1, 5, 2};
     insertionSort(nums, 6);
-    printf("插入排序完成后 nums = \n");
+    printf("插入排序完成后 nums = ");
     for (int i = 0; i < 6; i++)
     {
         printf("%d ", nums[i]);
diff --git a/codes/c/include/CMakeLists.txt b/codes/c/include/CMakeLists.txt
new file mode 100644
index 000000000..4189ae334
--- /dev/null
+++ b/codes/c/include/CMakeLists.txt
@@ -0,0 +1,4 @@
+add_executable(include
+        include_test.c
+        include.h print_util.h
+        list_node.h tree_node.h)
\ No newline at end of file
diff --git a/codes/c/include/PrintUtil.h b/codes/c/include/PrintUtil.h
deleted file mode 100644
index 59a8eac1b..000000000
--- a/codes/c/include/PrintUtil.h
+++ /dev/null
@@ -1,28 +0,0 @@
-/**
- * File: PrintUtil.h
- * Created Time: 2022-12-21
- * Author: MolDum (moldum@163.com)
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-
-// #include "ListNode.h"
-// #include "TreeNode.h"
-
-/**
- * @brief Print an Array
- * 
- * @param arr 
- * @param n 
- */
-
-static void printArray(int* arr, int n)
-{
-    printf("[");
-    for (int i = 0; i < n - 1; i++) {
-        printf("%d, ", arr[i]);
-    }
-    printf("%d]\n", arr[n-1]);
-}
diff --git a/codes/c/include/include.h b/codes/c/include/include.h
index 2c4fd9252..9f30b0529 100644
--- a/codes/c/include/include.h
+++ b/codes/c/include/include.h
@@ -1,13 +1,28 @@
 /**
  * File: include.h
  * Created Time: 2022-12-20
- * Author: MolDuM (moldum@163.com)
+ * Author: MolDuM (moldum@163.com)、Reanon (793584285@qq.com)
  */
 
+#ifndef C_INCLUDE_H
+#define C_INCLUDE_H
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
 #include <time.h>
 
-#include "PrintUtil.h"
+#include "list_node.h"
+#include "tree_node.h"
+#include "print_util.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // C_INCLUDE_H
diff --git a/codes/c/include/include_test.c b/codes/c/include/include_test.c
new file mode 100644
index 000000000..baa8e649d
--- /dev/null
+++ b/codes/c/include/include_test.c
@@ -0,0 +1,38 @@
+/**
+ * File: include_test.c
+ * Created Time: 2023-01-10
+ * Author: Reanon (793584285@qq.com)
+ */
+
+#include "include.h"
+
+void testListNode() {
+    int nums[] = {2, 3, 5, 6, 7};
+    int size = sizeof(nums) / sizeof(int);
+    ListNode *head = ArrayToLinkedList(nums, size);
+    PrintLinkedList(head);
+
+    ListNode *node = GetListNode(head, 5);
+    printf("find node: %d\n", node->val);
+}
+
+void testTreeNode() {
+    int nums[] = {1, 2, 3, NIL, 5, 6, NIL};
+    int size = sizeof(nums) / sizeof(int);
+    TreeNode *root = ArrayToTree(nums, size);
+
+    // print tree
+    PrintTree(root);
+
+    // tree to arr
+    int *arr = TreeToArray(root);
+    PrintArray(arr, size);
+}
+
+int main(int argc, char *argv[]) {
+    printf("==testListNode==\n");
+    testListNode();
+    printf("==testTreeNode==\n");
+    testTreeNode();
+    return 0;
+}
diff --git a/codes/c/include/list_node.h b/codes/c/include/list_node.h
new file mode 100644
index 000000000..5597d2102
--- /dev/null
+++ b/codes/c/include/list_node.h
@@ -0,0 +1,72 @@
+/**
+ * File: list_node.h
+ * Created Time: 2023-01-09
+ * Author: Reanon (793584285@qq.com)
+ */
+#ifndef LIST_NODE_H
+#define LIST_NODE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Definition for a singly-linked list node
+ *
+ */
+struct ListNode {
+    int val;               // 结点值
+    struct ListNode *next; // 指向下一结点的指针（引用）
+};
+
+// typedef 为 C 语言的关键字，作用是为一种数据类型定义一个新名字
+typedef struct ListNode ListNode;
+
+ListNode *NewListNode(int val) {
+    ListNode *node, *next;
+    node = (ListNode *) malloc(sizeof(ListNode));
+    node->val = val;
+    node->next = NULL;
+    return node;
+}
+
+/**
+ * @brief Generate a linked list with a vector
+ *
+ * @param list
+ * @return ListNode*
+ */
+
+ListNode *ArrayToLinkedList(const int *arr, size_t size) {
+    if (size <= 0) {
+        return NULL;
+    }
+
+    ListNode *dummy = NewListNode(0);
+    ListNode *node = dummy;
+    for (int i = 0; i < size; i++) {
+        node->next = NewListNode(arr[i]);
+        node = node->next;
+    }
+    return dummy->next;
+}
+
+/**
+ * @brief Get a list node with specific value from a linked list
+ *
+ * @param head
+ * @param val
+ * @return ListNode*
+ */
+ListNode *GetListNode(ListNode *head, int val) {
+    while (head != NULL && head->val != val) {
+        head = head->next;
+    }
+    return head;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // LIST_NODE_H
\ No newline at end of file
diff --git a/codes/c/include/print_util.h b/codes/c/include/print_util.h
new file mode 100644
index 000000000..fcb0a4ca6
--- /dev/null
+++ b/codes/c/include/print_util.h
@@ -0,0 +1,135 @@
+/**
+ * File: print_util.h
+ * Created Time: 2022-12-21
+ * Author: MolDum (moldum@163.com)、Reanon (793584285@qq.com)
+ */
+
+#ifndef PRINT_UTIL_H
+#define PRINT_UTIL_H
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "list_node.h"
+#include "tree_node.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * @brief Print an Array
+ *
+ * @param arr
+ * @param size
+ */
+static void PrintArray(int *arr, int size) {
+    printf("[");
+    for (int i = 0; i < size - 1; i++) {
+        if (arr[i] != NIL) {
+            printf("%d, ", arr[i]);
+        } else {
+            printf("NULL, ");
+        }
+    }
+    if (arr[size - 1] != NIL) {
+        printf("%d]\n", arr[size - 1]);
+    }else{
+        printf("NULL]\n");
+    }
+}
+
+/**
+ * @brief Print a linked list
+ *
+ * @param head
+ */
+static void PrintLinkedList(ListNode *node) {
+    if (node == NULL) {
+        return;
+    }
+    while (node->next != NULL) {
+        printf("%d -> ", node->val);
+        node = node->next;
+    }
+    printf("%d\n", node->val);
+}
+
+struct Trunk {
+    struct Trunk *prev;
+    char *str;
+};
+
+typedef struct Trunk Trunk;
+
+Trunk *newTrunk(Trunk *prev, char *str) {
+    Trunk *trunk = (Trunk *) malloc(sizeof(Trunk));
+    trunk->prev = prev;
+    trunk->str = (char *) malloc(sizeof(char) * 10);
+    strcpy(trunk->str, str);
+    return trunk;
+}
+
+/**
+ * @brief Helper function to print branches of the binary tree
+ *
+ * @param trunk
+ */
+void showTrunks(Trunk *trunk) {
+    if (trunk == NULL) {
+        return;
+    }
+    showTrunks(trunk->prev);
+    printf("%s", trunk->str);
+}
+
+/**
+ * Help to print a binary tree, hide more details
+ * @param node
+ * @param prev
+ * @param isLeft
+ */
+static void printTreeHelper(TreeNode *node, Trunk *prev, bool isLeft) {
+    if (node == NULL) {
+        return;
+    }
+    char *prev_str = "    ";
+    Trunk *trunk = newTrunk(prev, prev_str);
+    printTreeHelper(node->right, trunk, true);
+    if (prev == NULL) {
+        trunk->str = "———";
+    } else if (isLeft) {
+        trunk->str = "/———";
+        prev_str = "   |";
+    } else {
+        trunk->str = "\\———";
+        prev->str = prev_str;
+    }
+    showTrunks(trunk);
+    printf("%d\n", node->val);
+
+    if (prev != NULL) {
+        prev->str = prev_str;
+    }
+    trunk->str = "   |";
+
+    printTreeHelper(node->left, trunk, false);
+}
+
+/**
+ * @brief Print a binary tree
+ *
+ * @param head
+ */
+static void PrintTree(TreeNode *root) {
+    printTreeHelper(root, NULL, false);
+}
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // PRINT_UTIL_H
diff --git a/codes/c/include/tree_node.h b/codes/c/include/tree_node.h
new file mode 100644
index 000000000..4b0e70187
--- /dev/null
+++ b/codes/c/include/tree_node.h
@@ -0,0 +1,131 @@
+/**
+ * File: tree_node.h
+ * Created Time: 2023-01-09
+ * Author: Reanon (793584285@qq.com)
+ */
+
+
+#ifndef TREE_NODE_H
+#define TREE_NODE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NIL ('#')
+#define MAX_NODE_SIZE 5000
+
+struct TreeNode {
+    int val;
+    int height;
+    struct TreeNode *left;
+    struct TreeNode *right;
+};
+
+typedef struct TreeNode TreeNode;
+
+
+TreeNode *NewTreeNode(int val) {
+    TreeNode *node;
+
+    node = (TreeNode *) malloc(sizeof(TreeNode));
+    node->val = val;
+    node->height = 0;
+    node->left = NULL;
+    node->right = NULL;
+    return node;
+}
+
+/**
+ * @brief Generate a binary tree with an array
+ *
+ * @param arr
+ * @param size
+ * @return TreeNode *
+ */
+TreeNode *ArrayToTree(const int *arr, size_t size) {
+    if (size <= 0) {
+        return NULL;
+    }
+
+    int front, rear, index;
+    TreeNode *root, *node;
+    TreeNode **queue;
+
+    /* 根结点 */
+    root = NewTreeNode(arr[0]);
+    /* 辅助队列 */
+    queue = (TreeNode **) malloc(sizeof(TreeNode) * MAX_NODE_SIZE);
+    // 队列指针
+    front = 0, rear = 0;
+    // 将根结点放入队尾
+    queue[rear++] = root;
+    // 记录遍历数组的索引
+    index = 0;
+    while (front < rear) {
+        // 取队列中的头结点，并让头结点出队
+        node = queue[front++];
+        index++;
+        if (index < size) {
+            if (arr[index] != NIL) {
+                node->left = NewTreeNode(arr[index]);
+                queue[rear++] = node->left;
+            }
+        }
+        index++;
+        if (index < size) {
+            if (arr[index] != NIL) {
+                node->right = NewTreeNode(arr[index]);
+                queue[rear++] = node->right;
+            }
+        }
+    }
+    return root;
+}
+
+
+/**
+ * @brief Generate a binary tree with an array
+ *
+ * @param arr
+ * @param size
+ * @return TreeNode *
+ */
+int *TreeToArray(TreeNode *root) {
+    if (root == NULL) {
+        return NULL;
+    }
+    int front, rear;
+    int index, *arr;
+    TreeNode *node;
+    TreeNode **queue;
+    /* 辅助队列 */
+    queue = (TreeNode **) malloc(sizeof(TreeNode) * MAX_NODE_SIZE);
+    // 队列指针
+    front = 0, rear = 0;
+    // 将根结点放入队尾
+    queue[rear++] = root;
+    /* 辅助数组 */
+    arr = (int *) malloc(sizeof(int) * MAX_NODE_SIZE);
+    // 数组指针
+    index = 0;
+    while (front < rear) {
+        // 取队列中的头结点，并让头结点出队
+        node = queue[front++];
+        if (node != NULL) {
+            arr[index] = node->val;
+            queue[rear++] = node->left;
+            queue[rear++] = node->right;
+        } else {
+            arr[index] = NIL;
+        }
+        index++;
+    }
+    return arr;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // TREE_NODE_H