Chapter 18, Problem 31RQE

Explanation of Solution

Stack:

A stack is type of container. It performs “Last In First Out”.

• In stack, the item which is inserted at last will be retrieved first.
• A stack can perform two operations. They are:
  • Push – Inserting an element inside a stack.
    • When the first element is pushed into the stack, the element will be at the “top” the stack. When the second element is added, the first element is pushed down and the second element will be at the top position, like this it goes on until the element which pushed at last will be at the top of the stack...