Question: a) Describe two common uses of the NULL pointer in linked-list implementations. b) Given the following C++ statements, indicate what they accomplish. class node {

a) Describe two common uses of the NULL pointer in linked-list implementations. b) Given the following C++ statements, indicate what they accomplish. class node { public: typedef double value_type: node(const value_type& init_data = value-type(), node* init_link = NULL) {data_field = init_ data: link_field = init_link;} ..//member functions private: value_type data_field: node* link_field: }

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