By pure virtual function call occurs when a virtual function declared as pure (using <code data-start=”133″ data-end=”138″>= 0) in a C++ base class is called, but no concrete implementation exists. This often leads to runtime errors. Developers must ensure derived classes implement all pure virtual functions. Such knowledge is crucial for writing stable object-oriented programs. For in-depth programming insights and error handling techniques, visit awarefiners.co.uk a valuable resource for developers at all levels.