Using this setup, create a doubly linked list that allows for inserting, removing, and outputting data at a certain index

#include // Provides sizet and NULL class dnode public: - /I TYPEDEF typedef double value_type; /CONSTRUCTOR dnode( const value_type& init_data value_type(, dnode* init-fore = NULL, dnode* initback = NULL - data field init data; link-fore = init-fore; link_back-init_back; // Member functions to set the data and link fields: void set data(const value type& new_data) data field new_data; h void set fore(dnodex new_fore) void set back (dnodex new_back) { link-fore= new-fore; } f link back new_back; // Const member function to retrieve the current data: value_type data() constt return data field; h // Two slightly different member functions to retrieve each current link: const dnodex fore( const t return link fore; h dnodex fore) const dnode* back const return link back; ) dnodex back) return link fore; t return link back; h private: value_type data field; dnode xlink_fore dnode *link back; b