Step 1: IF AVAIL = NULL
Write OVERFLOW
Go to Step 7
[END OF IF]
Step 2: SET NEW_NODE = AVAIL
Step 3: SET AVAIL = AVAIL -> NEXT
Step 4: SET NEW_NODE -> DATA = VAL
Step 5: SET NEW_NODE -> NEXT = HEAD
Step 6: SET HEAD = NEW_NODE
Step 7: EXIT

Step 1: IF REAR = MAX-1
Write OVERFLOW
Goto step 4
[END OF IF]
Step 2: IF FRONT=-1 and REAR=-1
SET FRONT = REAR = 0
ELSE
SET REAR = REAR + 1
[END OF IF]
Step 3: SET QUEUE[REAR] = ITEM
Step 4: EXIT

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