• C

linked list rep. of stack

What is the code for a linked list rep. of a stack in C++.
Lost my code. need it though.
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baprebapConnect With a Mentor Commented:
i will just write the POP and PUSH for you.
define a struvture as follows

struct  stacktype
 char *info;
 struct stacktype *link;;

allocate memory dynamically using the malloc() command.
firstnode is initialised to NULL in the main().the fn is invoked as
pop is also called as above except that it does not take the char * field.
you may use typedef for struct stacktype * .it will be a better programming style.
pop may also be used to return the element deleted..to do so change the return type

struct stacktype *push(struct stacktype *firstnode,char *info)
 struct stacktype *newnode;
 newnode=(struct stacktype *)malloc(sizeof(stacktype));
 if (newnode==NULL) return(firstnode);
 if (firstnode==NULL)

struct stacktype *pop(struct stacktype * firstnode)
 struct stacktype *save=firstnode;
 cout << "The element popped is ;" << save->info;

This question sounds suspiciously like homework.  In that case t will be unethical for us to write it for you.  However, we can help with *specific* problems.

To get you started:

A stack usually implements two operations, PUSH - which pushes an item on the stack and POP - which returns the topmost item and removes it from the stack (sometimes the query and removal are split into two distinct operations).

An implementation using a linked-list can either add and remove items from the beginning of the list (if the list supports such operations) or keep a pointer to the last item.

Case #1:
  PUSH(item) - Add the new item to the beginning of the list.
  POP() - Return the first item and remove it from the list.

Case #2:
  PUSH(item) - Add the new item to the end of the list and update the pointer.
  POP() - Return the item pointed to (last item) and remove it from the list.

krnAuthor Commented:
Well in that case, I must decrease the points.
I will, on the pother hand, ask more questions about the problem as they arise.
krnAuthor Commented:
That is really what I was having problems with.
>> Well in that case, I must decrease the points.
You cannot decrease points for a question.  However, you can delete a question that has no pending or rejected answers and submit another one (that is the reason I gave a comment and not an "answer").

This is just for reference since I see you got your answer.
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