1. Push :

Step 1 : If TOP = MAXSTK, then : Print : OVERFLOW , and Return.
Step 2 : Set TOP := TOP + 1,
Step 3 : Set STACK[TOP := ITEM.
Step 4 : Return.

2. Pop :

Step 1 : If TOP = 0, then : Print UNDERFLOW , and Return.
Step 2 : Set ITEm := STACK[TOP]
Step 3 : Set TOP := TOP-1,
Step 4 : Return.