How can stacks be used to check for balanced parentheses in an expression?

How can stacks be used to check for balanced parentheses in an expression?

Step 1: Initialize an empty stack to keep track of opening parentheses.
Step 2: Read the expression from left to right, one character at a time.
Step 3: If you encounter an opening parenthesis '(', push it onto the stack.
Step 4: If you encounter a closing parenthesis ')', check if the stack is empty.
Step 5: If the stack is empty when you find a closing parenthesis, it means there is no matching opening parenthesis, so the expression is unbalanced.
Step 6: If the stack is not empty, pop the top element from the stack (which should be the matching opening parenthesis).
Step 7: Continue this process until you have read the entire expression.
Step 8: After reading the expression, check the stack again. If it is empty, the parentheses are balanced. If it is not empty, they are unbalanced.

Stack Data Structure – A stack is a linear data structure that follows the Last In First Out (LIFO) principle, where elements are added and removed from the top.
Balanced Parentheses – An expression is considered to have balanced parentheses if every opening parenthesis has a corresponding closing parenthesis in the correct order.
Push and Pop Operations – In the context of stacks, 'push' adds an element to the top of the stack, while 'pop' removes the top element.