I have class A:

//A.h

`public:
A();`

//A.hpp

#include "A.h"

A::A(){
std::cout<<"constructor"ף
}

I have several places in the code that do an instance of “A” like that:

A a;

but I get error “one or more multiply defined symbols found“
but when I copy the implamntion of “A” constructor to “A.cpp” or to “A.h” I dont get the error.

what is the problem?
How is it going in cpp?