Question

constructor is in implementation file or main program file?

Answer 1

The definition, or the invokation of the constructor?

Answer 2

I'd like to take a guess, constructor implementation is in the main program file. :p

Answer 3

Right; you have a header file, like myclass.h, with the class definition and all the constructors and destructors and method prototypes and definitions.

// Myclass.h
class Myclass
{
Myclass();
~Myclass();
// More stuff
};

Then you have a separate file implementing those constructors and destructors etc.

// Myclass.cpp
Myclass::Myclass()
{
// ctor
}

Myclass::~Myclass()
{
// dtor
}

// More stuff

Answer 4

You don't typically have either defined in the same file as the main function. Instead, you would include Myclass.h if you want to use Myclass objects.

#include "Myclass.h"

int main()
{
Myclass myobject;
// etc.
}

Answer 5

sorry I forgot to put `public:' before the constructors and destructors :-P