diff --git a/Appendix B/dynamic_array_test.cpp b/Appendix B/dynamic_array_test.cpp
new file mode 100644
index 00000000..0561dce4
--- /dev/null
+++ b/Appendix B/dynamic_array_test.cpp	
@@ -0,0 +1,53 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int* arr;
+int len = 0; // 실제 데이터가 들어있는 크기
+int capacity = 0; // 현재 삽입이 가능한 최대 크기
+
+void init(){
+  arr = new int[1];
+  capacity = 1;
+}
+
+void expand(){
+
+}
+
+void insert(int idx, int num){
+  if(???????){
+    expand();
+  }
+
+  for(int i = len; i > idx; i--)
+    arr[i] = arr[i-1];
+  arr[idx] = num;
+  len++;
+}
+
+void printArr(){
+  for(int i = 0; i < len; i++) cout << arr[i] << ' ';
+  cout << "| " << len << ' ' << capacity;
+  cout << "\n\n";
+}
+
+void insert_test(){
+  cout << "***** insert_test *****\n";
+  insert(0, 10); // 10, len = 1, capacity = 1
+  printArr();
+  insert(0, 30); // 30 10, len = 2, capacity = 2
+  printArr();
+  insert(1, 20); // 30 20 10, len = 3, capacity = 4
+  printArr();
+  insert(3, 40); // 30 20 10 40, len = 4, capacity = 4
+  printArr();
+  insert(1, 50); // 30 50 20 10 40, len = 5, capacity = 8
+  printArr();
+  insert(0, 15); // 15 30 50 20 10 40, len = 6, capacity = 8
+  printArr();
+}
+
+int main(void) {
+  init();
+  insert_test();
+}