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dblinkl.cpp
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dblinkl.cpp：Code Content
  1. #include <iostream.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  5. class list_object 
  6. {
  7.  public:
  8.    char info;
  9.    list_object *next;
  10.    list_object *previous;
  11.    list_object(void) {
  12.       info = 0;
  13.       next = NULL;
  14.       previous = NULL;
  15.     }
  16.    list_object *getnext(void) {return next;}
  17.    list_object *getprevious(void) {return previous;}
  18.    void getinfo(char &c) { c = info;}
  19.    void change(char c) {info = c;}
  20.    friend ostream &operator<<(ostream &stream, list_object o)
  21.     {
  22.       stream << o.info << endl;
  23.       return stream;
  24.     }
  25.    friend ostream &operator<<(ostream &stream, list_object *o)
  26.     {
  27.       stream << o->info << endl;
  28.       return stream;
  29.     }
  30.    friend istream &operator>>(istream &stream, list_object &o)
  31.     {
  32.       cout << "Enter information: " << endl;
  33.       stream >> o.info;
  34.       return stream;
  35.     }
  36.  };