diff --git a/.gitignore b/.gitignore
index 66ee80a..f8d8e76 100644
--- a/.gitignore
+++ b/.gitignore
@@ -201,3 +201,4 @@ fabric.properties
 # Android studio 3.1+ serialized cache file
 .idea/caches/build_file_checksums.ser
 
+vperf
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..8a5fc0c
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,15 @@
+cmake_minimum_required (VERSION 2.8)
+
+# veypi
+# projectname is the same as the main-executable
+project(vperf)
+
+add_definitions('-g')
+add_definitions('-Wall')
+#add_definitions('-std=c++11')
+
+
+add_executable(${PROJECT_NAME} main.c test.c)
+
+#add_custom_target(${PROJECT_NAME}-symlink ALL ln --force -s ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME} ${CMAKE_SOURCE_DIR}/${PROJECT_NAME} DEPENDS ${PROJECT_NAME})
+set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES ${CMAKE_SOURCE_DIR}/${PROJECT_NAME})
diff --git a/include/test.h b/include/test.h
new file mode 100644
index 0000000..4972c8f
--- /dev/null
+++ b/include/test.h
@@ -0,0 +1,17 @@
+/*
+ * test.h
+ * Copyright (C) 2021 light <light@lightdeMBP>
+ *
+ * Distributed under terms of the MIT license.
+ */
+
+#ifndef TEST_H
+#define TEST_H
+
+
+#include<math.h>
+
+double get_sqrt(double var1);
+
+
+#endif /* !TEST_H */
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..43b9a79
--- /dev/null
+++ b/main.c
@@ -0,0 +1,19 @@
+/*
+ * main.c
+ * Copyright (C) 2021 light <light@lightdeMBP>
+ *
+ * Distributed under terms of the MIT license.
+ */
+
+#include<stdio.h>
+#include"./include/test.h"
+
+int main()
+{
+    double b=25.0;
+    double a=0.0;
+    a=get_sqrt(b);
+    printf("a is %lf, b is %lf\n",a,b);
+    return 0;
+}
+
diff --git a/test.c b/test.c
new file mode 100644
index 0000000..66dacdc
--- /dev/null
+++ b/test.c
@@ -0,0 +1,14 @@
+/*
+ * test.c
+ * Copyright (C) 2021 light <light@lightdeMBP>
+ *
+ * Distributed under terms of the MIT license.
+ */
+
+#include "./include/test.h"
+
+
+double get_sqrt(double var1)
+{
+    return sqrt(var1);
+}