Virtual Labs

What is the primary operation of a stack?

Last In, First Out (LIFO)
First In, First Out (FIFO)
Random Access
None of the above

Which operation is used to add an element to the stack?

Push
Pop
Peek
Insert

What happens when you try to pop an element from an empty stack?

Stack Underflow
Stack Overflow
Null Pointer Exception
No effect

Which operation allows you to view the top element of the stack without removing it?

Peek
Pop
Push
Top

What is the time complexity of the push and pop operations in a stack implemented using an array?

O(1)
O(n)
O(log n)
O(n²)

Stack Implementation Using Array Pretest