FAQ (Frequently Asked Questions)
- error: use of undeclared identifier 'nullptr'

error: use of undeclared identifier 'nullptr'

$ g++ -o main *.cpp
- HW08.cpp:5:19: warning: default member initializer for non-static data member is a C++11 extension [-Wc++11-extensions]
-    BSTNode *root = nullptr;
-                 ^
- HW08.cpp:5:21: error: use of undeclared identifier 'nullptr'
-   BSTNode *root = nullptr;
-                 ^

The error and warning messages you're seeing indicate that the use of nullptr is not supported by the compiler you're using. You can fix this by adding the -std=c++11 flag to your compilation command:

g++ -std=c++11 -o output_file_name input_file_name.cpp

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