diff --git a/rotation.cpp b/rotation.cpp
index 7fefb59..0a169f5 100644
--- a/rotation.cpp
+++ b/rotation.cpp
@@ -17,6 +17,8 @@
 
 using namespace std;
 
+#define LOG cout << __FUNCTION__ << ": " << __LINE__ << " | "
+#define ERRLOG cerr << __FUNCTION__ << ": " << __LINE__ << " | "
 
 
 //
@@ -936,8 +938,8 @@ int main(int argc, char* argv[])
 
     if (!check_90(argv[1]))
     {
-      cerr << __LINE__ << " | 90 degrees check failed" << endl << endl;
-//      return 1;
+      ERRLOG << "90 degrees check failed" << endl << endl;
+      return 1;
     }
   }