Can anyone help me understand this error? “definition of implicitly-declared ‘classA::classA()’”

Question

Heres the code:

#include 
#include 
using namespace std;

class classA
{                   
      protected:
                v         


        

Answer 1

classA has no member named classA() to implement.

class classA
{
    // ....
    public:
       classA() ; // Missing the declaration of the default constructor.
};