Reviewing C in C++(cont) int iX extern int ix: int function; extern int function BO; Keyword extern? means it is only a declaration, its definition is later or external to this file, asking the compiler not to assign memory or generate code extern int functionB0ti//---invalidReviewing C in C++ (cont.) int iX; extern int iX; int functionB(); extern int functionB(); ◼ Keyword ‘extern’ means it is only a declaration, its definition is later or external to this file, asking the compiler not to assign memory or generate code ◼ extern int functionB() {}; //---invalid