diff --git a/CM2005 Object Oriented Programming/Topic 2/2.4.1/a.exe b/CM2005 Object Oriented Programming/Topic 2/2.4.1/a.exe
new file mode 100644
index 0000000..d5230da
Binary files /dev/null and b/CM2005 Object Oriented Programming/Topic 2/2.4.1/a.exe differ
diff --git a/CM2005 Object Oriented Programming/Topic 2/2.4.1/main.cpp b/CM2005 Object Oriented Programming/Topic 2/2.4.1/main.cpp
new file mode 100644
index 0000000..cbfdbff
--- /dev/null
+++ b/CM2005 Object Oriented Programming/Topic 2/2.4.1/main.cpp	
@@ -0,0 +1,34 @@
+#include <iostream>
+#include <string>
+#include <vector>
+
+class vec3D
+{
+  public:
+    int x;
+    int y;
+    int z;
+  private:
+    int size = 3;
+};
+
+vec3D vec1;
+
+void doSomething()
+{
+  vec1.x = 10;
+  vec1.y = 12;
+  vec1.z = 25;
+}
+
+int main()
+{
+  doSomething();
+  
+  //std::cout << vec1.x << std::endl;
+  //std::cout << vec1.size << std::endl;
+  std::vector<vec3D> coords;
+  coords.push_back(vec1);
+  std::cout << coords[0].x << std::endl;
+  return 0;
+}
\ No newline at end of file