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In a stack, what happens when you try to pop an element from an empty stack?

Practice Questions

Q1
In a stack, what happens when you try to pop an element from an empty stack?
  1. Returns null
  2. Throws an exception
  3. Returns 0
  4. Does nothing

Questions & Step-by-Step Solutions

In a stack, what happens when you try to pop an element from an empty stack?
  • Step 1: Understand what a stack is. A stack is a data structure that stores items in a last-in, first-out (LIFO) manner.
  • Step 2: Know what 'popping' means. Popping is the action of removing the top item from the stack.
  • Step 3: Recognize what an empty stack is. An empty stack has no items in it.
  • Step 4: When you try to pop from an empty stack, there are no items to remove.
  • Step 5: Because there are no items to pop, the system cannot complete the operation.
  • Step 6: As a result, the system usually throws an exception. An exception is a message that indicates an error has occurred.
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