Podcast
Questions and Answers
What is the result of evaluating the postfix expression '7 4 -3 * 1 5 + / *'?
What is the result of evaluating the postfix expression '7 4 -3 * 1 5 + / *'?
In postfix evaluation, you pop operands from the stack before applying an operator.
In postfix evaluation, you pop operands from the stack before applying an operator.
True
What do you do when you encounter an operator during postfix evaluation?
What do you do when you encounter an operator during postfix evaluation?
Pop operands from the stack, evaluate the operator, and push the result back to the stack.
In postfix notation, the expression '10 2 8 * +' results in _____ after processing all numbers.
In postfix notation, the expression '10 2 8 * +' results in _____ after processing all numbers.
Signup and view all the answers
Match the following terms with their definitions:
Match the following terms with their definitions:
Signup and view all the answers
What does LIFO stand for in relation to stacks?
What does LIFO stand for in relation to stacks?
Signup and view all the answers
Items removed from a stack are done so in the same order they were inserted.
Items removed from a stack are done so in the same order they were inserted.
Signup and view all the answers
Name one basic operation that can be performed on a stack.
Name one basic operation that can be performed on a stack.
Signup and view all the answers
To add an element to the top of the stack, the operation performed is called __________.
To add an element to the top of the stack, the operation performed is called __________.
Signup and view all the answers
Match the following stack operations with their descriptions:
Match the following stack operations with their descriptions:
Signup and view all the answers
What will be the value of 'top' after popping from a stack that currently has 'top = 3'?
What will be the value of 'top' after popping from a stack that currently has 'top = 3'?
Signup and view all the answers
The 'isEmpty' operation returns true when there are elements in the stack.
The 'isEmpty' operation returns true when there are elements in the stack.
Signup and view all the answers
Describe how to implement a stack using an array.
Describe how to implement a stack using an array.
Signup and view all the answers
What operation removes the top element from a stack in a linked list implementation?
What operation removes the top element from a stack in a linked list implementation?
Signup and view all the answers
Pushing an element onto a stack adds it to the end of the linked list.
Pushing an element onto a stack adds it to the end of the linked list.
Signup and view all the answers
What is the main data structure used for implementing a stack in the provided content?
What is the main data structure used for implementing a stack in the provided content?
Signup and view all the answers
In a stack, the operation ______ adds an element to the top.
In a stack, the operation ______ adds an element to the top.
Signup and view all the answers
Match the actions with their descriptions in stack operations:
Match the actions with their descriptions in stack operations:
Signup and view all the answers
Which of the following is NOT a typical application of stacks?
Which of the following is NOT a typical application of stacks?
Signup and view all the answers
In the reversal of a string using a stack, the last character pushed is the first to be popped.
In the reversal of a string using a stack, the last character pushed is the first to be popped.
Signup and view all the answers
What does the pop operation return in a stack?
What does the pop operation return in a stack?
Signup and view all the answers
What action should be taken when encountering a right parenthesis ')'?
What action should be taken when encountering a right parenthesis ')'?
Signup and view all the answers
Infix to postfix conversion does not require considering operator precedence.
Infix to postfix conversion does not require considering operator precedence.
Signup and view all the answers
In the expression (A + (B * C - (D / E^F) * G) * H), what is the final postfix expression?
In the expression (A + (B * C - (D / E^F) * G) * H), what is the final postfix expression?
Signup and view all the answers
When a reading symbol is an operand, it should be ______ to the result.
When a reading symbol is an operand, it should be ______ to the result.
Signup and view all the answers
Match the following symbols with their respective actions:
Match the following symbols with their respective actions:
Signup and view all the answers
In the example expression 10 + 2 * 8 - 3, what happens when the operator * is encountered?
In the example expression 10 + 2 * 8 - 3, what happens when the operator * is encountered?
Signup and view all the answers
An operator with lower precedence than the stack's top operator gets pushed to the stack.
An operator with lower precedence than the stack's top operator gets pushed to the stack.
Signup and view all the answers
What is the outcome when encountering an operator with higher or equal precedence than the one on the top of the stack?
What is the outcome when encountering an operator with higher or equal precedence than the one on the top of the stack?
Signup and view all the answers
Study Notes
Stacks
- Stacks are lists with the restriction that insertions and deletions occur at the same end.
- Elements are added and removed in a Last-In, First-Out (LIFO) manner.
- Operations on a stack include: push (add), pop (remove), and peek (retrieve top element).
- Stacks are useful when the order of operations must be reversed.
Stack Operations
-
push: Adds an element to the top of the stack. -
pop: Removes an element from the top of the stack. -
peek: Retrieves the top element of the stack. -
isEmpty: Checks if the stack is empty. -
size: Returns the number of elements in the stack.
Stack Implementation (Using Arrays)
- A fixed-size array is used to store stack elements.
- A variable
topkeeps track of the index of the top element. -
topis initialized to -1 when the stack is empty. -
pushincrementstopand stores the new element atstack[top]. -
popretrieves the element atstack[top], decrementstop, and returns the element. -
MAXSIZEdefines the maximum size of the array.
Stack Implementation (Using Linked Lists)
- A dynamic structure (using pointers).
- A
Nodestructure, containing data and a pointer to the next Node. -
toppoints to the top element (head of the list). -
pushinserts a new node at the beginning of the list. -
popremoves the node at the beginning of the list.
Stack Applications
- String reversal: Pushing characters into a stack and then popping them out reverses them.
- Bracket matching: Using a stack for parenthesis checks. If a closing bracket is encountered and corresponding opening bracket is not present in the stack, there is a mismatch.
- Postfix Evaluation: Evaluating expressions written in postfix notation (e.g., 10 2 +).
- Function calls: Tracking function calls in programming.
- Browsers: Storing visited pages in a LIFO manner.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Explore the fundamental concepts of stacks, including LIFO behavior and essential operations like push, pop, and peek. Understand stack implementation using arrays and learn how to manage size and check for emptiness. This quiz will test your knowledge on the essential operations and structure of stacks.
