Why to add public: Daughter() {}; in this example

Question

I just want to know whether its necessary or a best practice to add this statement "public: Daughter() {};" after declaring a child class in this example
#include <iostream>
using namespace std;

class Mother
{
public:
Mother() {};
void sayHi() {
cout << "Hi";
}
};

class Daughter: public Mother
{
public:
Daughter() {};
};

int main() {
Daughter d;
d.sayHi();
}
//Outputs "Hi"

Even without adding that statement I am getting the same result. Am I missing something. I just used
class Daughter: public Mother
{

};

Answer 1

If you don't add "public:", the constructor will be private. If there's no available public constructor, a default one will be made, which does exactly the same thing your current one does.