diff --git a/source/main.cpp b/source/main.cpp
index 345445f134..83193ca7aa 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -12,8 +12,11 @@
 #include <omp.h>
 #endif
 
+#include <iostream>
+
 int main(int argc, char** argv)
 {
+    std::cout<<"test"<<std::endl;
     /*
     read the arguement in the command-line,
     with "abacus -v", the program exit and returns version info,
@@ -53,4 +56,4 @@ int main(int argc, char** argv)
 #endif
 
     return 0;
-}
\ No newline at end of file
+}