PUSH Operation
Push(stack, top, maxstk, item)
1. [stack already filled?]
If top = maxstk then : print :
OVERFLOW and return.
2. Set top : = top +1 . [increases top by
1]
3. Set stack[top] := item [inserts item in new
TOP position]
4. Return.
POP Operation
Pop(stack, top, item)
variable item.
1. [Stack has an item to be removed?]
If top := 0, then : print :
UNDERFLOW and return.
2. Set item := stack[top]. [assigns top element
to item].
3. Set top := top -1.[decreases top by 1].
