Is there default constructor in this code?

Question

// CPP program to demonstrate working of STL stack
#include <iostream>
#include <stack>
using namespace std;

void showstack(stack <int> s)
{
while (!s.empty())
{
cout << '\t' << s.top();
s.pop();
}
cout << '\n';
}

int main ()
{
stack <int> s;
s.push(10);
s.push(30);
s.push(20);
s.push(5);
s.push(1);

cout << "The stack is : ";
showstack(s);

cout << "\ns.size() : " << s.size();
cout << "\ns.top() : " << s.top();

cout << "\ns.pop() : ";
s.pop();
showstack(s);

return 0;
}

Answer 1

Is there a destructor in the code?

Answer 2

Do you write names? Ot do you also include something like @ before the name to make a name green?