C++, using stack.h read a string, then display it in reverse - c++

Question

For my current assignment, I have to use the following header file,
#ifndef STACK_H
#define STACK_H
template <class T, int n>
class STACK
{
private:
T a[n];
int counter;
public:
void MakeStack() {
counter = 0;
}
bool FullStack() {
return (counter == n) ? true : false ;
}
bool EmptyStack() {
return (counter == 0) ? true : false ;
}
void PushStack(T x) {
a[counter] = x;
counter++;
}
T PopStack() {
counter--;
return a[counter];
}
};
#endif
To write a program that will take a sentence, store it into the "stack", and then display it in reverse, and I have to allow the user to repeat this process as much as they want. The thing is, I am NOT allowed to use arrays (otherwise I wouldn't need help with this), and am finding myself stumped.
To give an idea of what I am attempting, here is my code as of posting, which obviously does not work fully but is simply meant to give an idea of the assignment.
#include <iostream>
#include <cstring>
#include <ctime>
#include "STACK.h"
using namespace std;
int main(void)
{
auto time_t a;
auto STACK<char, 256> s;
auto string curStr;
auto int i;
// Displays the current time and date
time(&a);
cout << "Today is " << ctime(&a) << endl;
s.MakeStack();
cin >> curStr;
i = 0;
do
{
s.PushStack(curStr[i]);
i++;
} while (s.FullStack() == false);
do
{
cout << s.PopStack();
} while (s.EmptyStack() == false);
return 0;
} // end of "main"
UPDATE
This is my code currently
#include <iostream>
#include <string>
#include <ctime>
#include "STACK.h"
using namespace std;
time_t a;
STACK<char, 256> s;
string curStr;
int i;
int n;
// Displays the current time and date
time(&a);
cout << "Today is " << ctime(&a) << endl;
s.MakeStack();
getline(cin, curStr);
i = 0;
n = curStr.size();
do
{
s.PushStack(curStr[i++]);
i++;
}while(i < n);
do
{
cout << s.PopStack();
}while( !(s.EmptyStack()) );
return 0;

Answer 1

You're on the right track, but you shouldn't be looping until the stack is full -- there are no guarantees curStr consists of at least 256 characters. Instead, loop like as follows...
int n = curStr.size();
do {
s.PushStack(curStr[i++]);
} while (i < n);
Now, you should really not write <bool-expr> == false or <bool-expr> == true... instead, merely write !<bool-expr> and <bool-expr>, respectively. You don't need all of your auto storage specifiers on the local variables, either. Your professor should also look into using the constructor rather than using MakeStack.
edit: It appears you had some trouble translating my code. You only need to i++ once per loop -- this increments our position in the string. As you are doing it now, you are actually incrementing the position twice and thus only pushing every other character.

Answer 2

Use a linked list instead of array in stack.
In the linked list, always store the tail pointer of your list's last node. Each node maintains a reference to your prev node.
A <--- B <---- C (tail)
push:
A <--- B <---- C <---- D (tail)
pop:
A <--- B <---- C (tail)
// D is popped out
when the tail == null, you know it is an empty stack