Stack: A stack is a linear data structure. The stack follows the order LIFO (last-in-first-out) for performing operations. The two main operations performed on stack are, Push() – Add item to stack. Pop() – Remove item from stack. “Push()” method: The “Push()” is a method used to insert or add an item to the stack. The element is pushed at the top of the stack. The “Push()” will have an item as its argument and it returns the argument which is passed. If the stack is full and when “push()” method is calls the push will generate “StackOverFlowException” and return. Syntax for push operation: STACK.push(E element) “Pop()” method: The method “pop()” is used to delete an item from the stack. This method does not have any argument and when this method called on a stack, the element at the top of the stack is removed. This method will return the top element before removing it. If the stack is empty (its size is equal to 0) and when the “pop()” method is called pop throws the “EmptyStackException” object. Syntax for pop operation: STACK.pop()

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Chapter 20.3, Problem 20.5CP

Program Plan Intro

Stack:

A stack is a linear data structure.

The stack follows the order LIFO (last-in-first-out) for performing operations.

The two main operations performed on stack are,

Push() – Add item to stack.

Pop() – Remove item from stack.

“Push()” method:

The “Push()” is a method used to insert or add an item to the stack. The element is pushed at the top of the stack.

The “Push()” will have an item as its argument and it returns the argument which is passed.

If the stack is full and when “push()” method is calls the push will generate “StackOverFlowException” and return.

Syntax for push operation:

STACK.push(E element)

“Pop()” method:

The method “pop()” is used to delete an item from the stack.

This method does not have any argument and when this method called on a stack, the element at the top of the stack is removed.

This method will return the top element before removing it.

If the stack is empty (its size is equal to 0) and when the “pop()” method is called pop throws the “EmptyStackException” object.

Syntax for pop operation:

STACK.pop()

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