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If a class uses dynamic memory then assume that all the constructors and destructor are required unless it says differently - then explicitly use =delete for those not required.

As you are preping for exams, consider



#include <algorithm>
using namespace std;

class Display
{
public:

When implementing a class that uses dynamic memory, as a minimum you need
- constructor(s)
- destructor
- copy constructor (or marked as deleted)
- copy assignment (or marked as deleted)

and...