/in/foo.cc: In constructor 'BigInt::BigInt(int)':
/in/foo.cc:29:79: warning: variable 'ptrPriorNode' set but not used [-Wunused-but-set-variable]
   DigitNode *ptrHeadNode = NULL, *ptrNewNode = NULL, *ptrCurrentNode = NULL, *ptrPriorNode = NULL;
                                                                               ^~~~~~~~~~~~
/in/foo.cc: In member function 'BigInt BigInt::IntegerToBigInt(int)':
/in/foo.cc:321:79: warning: variable 'ptrPriorNode' set but not used [-Wunused-but-set-variable]
   DigitNode *ptrHeadNode = NULL, *ptrNewNode = NULL, *ptrCurrentNode = NULL, *ptrPriorNode = NULL;
                                                                               ^~~~~~~~~~~~