diff --git a/cplusplus/cmake_ys/executable_staticlib/A/CMakeLists.txt b/cplusplus/cmake_ys/executable_staticlib/A/CMakeLists.txt
new file mode 100644
index 0000000..6d04d26
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/A/CMakeLists.txt
@@ -0,0 +1,7 @@
+add_subdirectory(TestA)
+add_subdirectory(LibA)
+
+target_link_libraries(TestA
+PRIVATE
+ LibA
+)
\ No newline at end of file
diff --git a/cplusplus/cmake_ys/executable_staticlib/A/LibA/CMakeLists.txt b/cplusplus/cmake_ys/executable_staticlib/A/LibA/CMakeLists.txt
new file mode 100644
index 0000000..d0660bf
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/A/LibA/CMakeLists.txt
@@ -0,0 +1,15 @@
+
+
+add_library(LibA)
+target_sources(LibA
+ PRIVATE
+    func1.cxx
+
+ PUBLIC
+    FILE_SET HEADERS
+    FILES
+      func1.h
+ 
+
+)
+
diff --git a/cplusplus/cmake_ys/executable_staticlib/A/LibA/func1.cxx b/cplusplus/cmake_ys/executable_staticlib/A/LibA/func1.cxx
new file mode 100644
index 0000000..6af7b9d
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/A/LibA/func1.cxx
@@ -0,0 +1,6 @@
+namespace LibA {
+double sqrt(double x)
+{
+  return -42;
+}
+}
\ No newline at end of file
diff --git a/cplusplus/cmake_ys/executable_staticlib/A/LibA/func1.h b/cplusplus/cmake_ys/executable_staticlib/A/LibA/func1.h
new file mode 100644
index 0000000..bf00781
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/A/LibA/func1.h
@@ -0,0 +1,3 @@
+namespace LibA {
+double sqrt(double x);
+}
diff --git a/cplusplus/cmake_ys/executable_staticlib/A/TestA/CMakeLists.txt b/cplusplus/cmake_ys/executable_staticlib/A/TestA/CMakeLists.txt
new file mode 100644
index 0000000..f9a44ba
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/A/TestA/CMakeLists.txt
@@ -0,0 +1,13 @@
+
+add_executable(TestA)
+
+target_sources(TestA
+PRIVATE
+testA.cxx
+)
+
+target_link_libraries(TestA
+PRIVATE
+ LibA
+)
+
diff --git a/cplusplus/cmake_ys/executable_staticlib/A/TestA/testA.cxx b/cplusplus/cmake_ys/executable_staticlib/A/TestA/testA.cxx
new file mode 100644
index 0000000..269678d
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/A/TestA/testA.cxx
@@ -0,0 +1,9 @@
+#include "iostream"
+#include "func1.h"
+
+int main()
+{
+
+    std::cout<<"hello world"<<std::endl<<LibA::sqrt(5);
+
+}
\ No newline at end of file
diff --git a/cplusplus/cmake_ys/executable_staticlib/B/CMakeLists.txt b/cplusplus/cmake_ys/executable_staticlib/B/CMakeLists.txt
new file mode 100644
index 0000000..8dba797
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/B/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_subdirectory(TestB)
+
diff --git a/cplusplus/cmake_ys/executable_staticlib/B/TestB/CMakeLists.txt b/cplusplus/cmake_ys/executable_staticlib/B/TestB/CMakeLists.txt
new file mode 100644
index 0000000..12e1a34
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/B/TestB/CMakeLists.txt
@@ -0,0 +1,6 @@
+
+add_executable(TestB)
+target_sources(TestB
+PRIVATE
+testB.cxx
+)
diff --git a/cplusplus/cmake_ys/executable_staticlib/B/TestB/testB.cxx b/cplusplus/cmake_ys/executable_staticlib/B/TestB/testB.cxx
new file mode 100644
index 0000000..a735f2f
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/B/TestB/testB.cxx
@@ -0,0 +1,8 @@
+#include "iostream"
+
+int main()
+{
+
+    std::cout<<"hello world"<<std::endl;
+
+}
\ No newline at end of file
diff --git a/cplusplus/cmake_ys/executable_staticlib/CMakeLists.txt b/cplusplus/cmake_ys/executable_staticlib/CMakeLists.txt
new file mode 100644
index 0000000..49861e5
--- /dev/null
+++ b/cplusplus/cmake_ys/executable_staticlib/CMakeLists.txt
@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.23)
+project(learning2)
+
+add_subdirectory(A)
+add_subdirectory(B)