1.

What is stack? Write an algorithm for POP operation.

Answer»

stack is an ordered collection of items in which items may be inserted and deleted at one end.
Algorithm for POP operation
PUSH(STACK, TOP, ITEM)
Step 1: if TOP = 0 then
PRINT “stack is empty”
Exit
End of if
Step 2: ITEM = STACK[POP]
Step 3: TOP = TOP -1
Step 4: Return



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