exercise 4.2

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E2.  Consider a linked stack that includes a method size.This method size requires a loop that moves through the entire stack to count the entries,since the bunber of entries in the stack is not kept as a separate member in the stack record.   (a) Write a method size for a linked stack by using a loop that moves a pointer variable from node to node through the stack. #include<iostream> using namespace std; typedef Stack_entry Node_entry; int main() {  class Stack  {  public:   Stack();   bool empty()const;   Error_code size(const Stack_entry&item);   Error_code top(Stack_entry&item)const;  protected:   Node*top_node;   int count=0;  }  Error_code Stack::top(Stack_entry&item)const;  {   if(top_node==NULL)    return underflow;   item=top_node->entry;   return success;  }  Error_code Stack::size(const Stack_entry&item)  {   if(top_node==NULL)    count=0;   else while(!empty())   {    Node*old_top=top_node;    top_node=old_top->next;    delete old_top;    count++;   }  }  return count; }

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