Question

Write a program that reads a string of characters, pushing each character onto a stack as it is read and simultaneously adding it to a queue. When the end of the string is encountered the program should use basic stack and queue operations to determine if the word is a palindrome.

Answer 1

Answer:

#include <iostream>

#include <stack>

#include <queue>

#include <string>

int main()

{

   while ( true )

   {

       std::string letters;

       std::cout << "Please enter a word (Enter - exit): ";

       std::getline( std::cin, letters );

       if ( letters.empty() ) break;

       std::stack<char>

           s( std::stack<char>::container_type( letters.begin(), letters.end() ) );

       std::queue<char>

           q( std::queue<char>::container_type( letters.begin(), letters.end() ) );

       while ( !s.empty() && s.top() == q.front() )

       {

           s.pop();

           q.pop();

       }

if ( s.empty() ) std::cout << "The word is a palindrome" << std::endl;

       else std::cout << "The word is not a palindrome" << std::endl;

   }

   return 0;

}

Explanation:

A stack is used to replicate a stack data structure in C++  while Queue container is a replica of the queue data structure in C++, Unlike stack, in the queue container, there are two ends, i.e. front, and back.

In the code above to be able to use used stack and queue, we included the headers #include <stack> and#include <queue>.