A stack for characters : stack « queue stack « C++ Tutorial

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2. queue stack
3. stack

#include <iostream>
#include <string>
#include <queue>
#include <stack>

using namespace std;
int main()
{
  stack<char> stck;

  cout << "A stack for characters.\n";

  cout << "Pushing A, B, C, and D.\n";
  stck.push('A');
  stck.push('B');
  stck.push('C');
  stck.push('D');

  cout << "Now, retrieve those values in LIFO order.\n";
  while(!stck.empty()) {
    cout << "Popping: ";
    cout << stck.top() << "\n";
    stck.pop();
  }

  return 0;
}