StackQuiz, C++ (gcc)

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//g++  7.4.0
//Stack Quiz
//credit internet, John R Hubbard, University of Richmond 
#include <iostream>
#include <string>
using namespace std;
template <class T>
class Stack{
int max;
int top;
T* data;
public:
Stack (int s=100) : max(s),top(-1){ data= new T[max];}
~Stack(){ delete [] data;}
bool push (const T&);
T pop();
bool isEmpty();
bool isFull();
};

template <class T>
bool Stack<T>::push(const T& x) {
if(top>(max-1)) {
cout <<" Sorry stack overflow!";
return false;
}
else   
     { 
         data[++top]=x;
    cout <<x<<endl;
return true;
    }
}

template <class T>
T  Stack<T>::pop()
{

if(top<0) {cout <<"Sorry stack underflow!";
return 0;
}
  else
          {
              T x = data[top--];
        return x;
       }
}
template <class T>
bool Stack<T>::isEmpty()
{
  return (top<0);
}
   
template <class T>
bool Stack<T>::isFull()
{
  return (top=max-1);
}
   
int main()
{
Stack<int> idStack(3);
Stack<char> namStack(3);
Stack<int> scoreStack(3);
idStack.push(3);
idStack.push(2);
idStack.push(1);
namStack.push('M');
namStack.push('L');
namStack.push('K');
scoreStack.push(10);
scoreStack.push(15);
scoreStack.push(20);
cout<<" Id, name and quiz score:\n";
cout <<idStack.pop()<<"\t"<<namStack.pop()<<"\t"<<scoreStack.pop()<<endl;
cout <<idStack.pop()<<"\t"<<namStack.pop()<<"\t"<<scoreStack.pop()<<endl;
cout <<idStack.pop()<<"\t"<<namStack.pop()<<"\t"<<scoreStack.pop()<<endl;
return 0;
}

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Compilation time: 0.42 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,73 sec