diff --git a/201816040230/Ex09_11/Ex09_11.cpp b/201816040230/Ex09_11/Ex09_11.cpp
new file mode 100644
index 00000000..71480647
--- /dev/null
+++ b/201816040230/Ex09_11/Ex09_11.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+using namespace std;
+#include "Rectangle.h"
+int main()
+{
+   Rectangle r(1.0,1.0);
+   double length,width;
+   cout<<"please input length and width"<<endl;
+   cin>>length>>width;
+   r.setlength(length);
+   r.setwidth(width);
+   r.print();
+
+} // end main