CHAPTER 4 Stacks and Queues 81 The Stack ADT L ADT A stack is a Last-In-First-Out(LIFO) list, that is an ordered list in which insertions and deletions are made at the top only Objects: A finite ordered list with zero or more elements Operations cInt StackEmpty Stack S) cInt Stack Full( Stack S); cG Stack Init Stack (; G MakeEmpty( Stack S ) Note: A Pop(or Get Top)on CG Push( Element Type X, Stack S) an empty stack is an error in the stack adt Element Type Get Top( Stack S) Push on a full stack is C Pop( Stack S) an implementation error but not an adt error§1 The Stack ADT 1. ADT 1 2 3 4 5 6 65 6 5 A stack is a Last-In-First-Out (LIFO) list, that is, an ordered list in which insertions and deletions are made at the top only. Objects: A finite ordered list with zero or more elements. Operations: Int StackEmpty( Stack S ); Int StackFull( Stack S );  Stack InitStack( );  MakeEmpty( Stack S );  Push( ElementType X, Stack S );  ElementType GetTop( Stack S );  Pop( Stack S ); Note:A Pop (or GetTop) on an empty stack is an error in the stack ADT. Push on a full stack is an implementation error but not an ADT error. CHAPTER 4 Stacks and Queues