2. Suppose a linked list of 20 nodes. The middle node has a data –250. Write the pseudocode to replace the middle node of the linked list with a new node and new data. Assume that the list's head pointer is called head_ptr and the data for the new node is called entry.

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1)consider the following code snippet: #ifndef book_h#define book_hconst double max_cost = 1000.0; class book{public: book(); book(double new_cost); void set_cost(double new_cost); double get_cost() const; private: double cost; }; double calculate_terms(book bk); #endifwhich of the following is correct? a)the header file is correct as given.b)the definition of max_cost should be removed since header files should not contain constants.c)the definition of book should be removed since header files should not contain class definitions.d)the body of the calculate_terms function should be added to the header file.