When a closing bracket appears, what must happen?
Practice this question from Valid Parentheses - Stack matching Pattern Practice Quiz, with options and an explanation.
Question
When a closing bracket appears, what must happen?
Option A — Correct answer
The stack top must match the closing bracket
Option B
Push the closing bracket always
Option C
Ignore the bracket type
Option D
Clear the whole stack
Explanation
The stack top must be the matching opening bracket.