Stack operations (push, pop, peek) in Data Structures Theory - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add an element to the top of the stack.

Data Structures Theory

stack.[1](element)

Drag options to blanks, or click blank then click option'

Apeek

Bpop

Cremove

Dpush

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pop' which removes an element instead of adding.

Using 'peek' which only views the top element without removing or adding.

The push operation adds an element to the top of the stack.

2fill in blank

medium

Complete the code to remove the top element from the stack.

Data Structures Theory

top_element = stack.[1]()

Drag options to blanks, or click blank then click option'

Apeek

Bpush

Cpop

Dinsert

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'push' which adds instead of removing.

Using 'peek' which only views the top element without removing it.

The pop operation removes and returns the top element of the stack.

3fill in blank

hard

Fix the error in the code to view the top element without removing it.

Data Structures Theory

top_element = stack.[1]()

Drag options to blanks, or click blank then click option'

Apeek

Bpop

Cpush

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pop' which removes the element instead of just viewing it.

Using 'push' which adds an element instead of viewing.

The peek operation returns the top element without removing it from the stack.

4fill in blank

hard

Fill both blanks to add an element and then view the top element.

Data Structures Theory

stack.[1](new_item)
top = stack.[2]()

Drag options to blanks, or click blank then click option'

Apush

Bpop

Cpeek

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pop' instead of 'peek' to view the top element.

Using 'remove' which is not a standard stack operation.

First, push adds the new item to the stack. Then, peek shows the top element without removing it.

5fill in blank

hard

Fill all three blanks to push an element, pop the top, and then peek at the new top.

Data Structures Theory

stack.[1](item)
popped = stack.[2]()
current_top = stack.[3]()

Drag options to blanks, or click blank then click option'

Apop

Bpush

Cpeek

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up push and pop operations.

Using 'remove' which is not a stack operation.

First, push adds the item. Then, pop removes the top element. Finally, peek shows the new top element.