Error: Unersolved external 'TestingLink::TestingLink()' reference from...

[xxxtriplerxxx]

//my testing.h code

#ifndef TESTING_H
#define TESTING_H

#include <iostream.h>

class TestingLink
{
public:
TestingLink();

private:
int value, height;
};

#endif

=======================

//my testing.cpp code

#include <iostream.h>
#iclude "testing.h"

TestingLink::TestingLink()
{
value = 10;
height = 4;
}

=======================

//my main code
#include <iostream.h>
#include "testing.h"

int main()
{
TestingLink();
return 0;
}


=======================

When I start compiling the implementation file, i get this error:

Error: Unresolved external 'TestingLink::TestingLink()' referenced from C:\BCC55\Template\testing_link.obj

Is this Windows environment linking problem of C++?
If I lack binaries, lib, .a, or .o, what are those?
There is nothing special about this program, this is only a sample.
nevertheless, i can't still compile it.

Please, help me...

[Banfa]

Error: Unresolved external 'TestingLink::TestingLink()' referenced from C:\BCC55\Template\testing_link.obj

Is this Windows environment linking problem of C++?

Yes this is a link error, the function 'TestingLink::TestingLink() was not found in any of the objects or libraries you provided to the linker.

The most linkely cause is that you have accidentally forgotten to include testing.cpp into your project (assuming you are using an IDE) or that you have left testing.obj off the linker command (if you are compiling and linking by hand).

[weaknessforcats]

Also, why are you using iostream.h???

That is the pre-ANS C++ that has been obsolete for 10 years. (and it doesn;t work)

You should be using iostream.