Stack · Class 12 · CBSE · Science Computer Science
What is stack underflow? State one condition that causes it and explain how it can be prevented in a Python implementation.
Practice question from Stack (Class 12 · CBSE · Science Computer Science), with the correct answer and a step-by-step solution.
medium · Subjective · Q-1EB58E
What is stack underflow? State one condition that causes it and explain how it can be prevented in a Python implementation.
Answer: Stack underflow occurs when an attempt is made to remove or access an item from an empty stack. It can occur when pop() is performed while the stack contains no elements. In Python, it can be prevented by checking whether the list is empty before calling pop(), such as with if len(stack) == 0.
Solution
Underflow means attempting a deletion from an empty stack. Checking the stack's length before pop() prevents the operation from causing an error.
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