Why cannot I compile these with Dev-C++?

[ferenczi]

Hello,

I've two examples, directly taken by my C++ manual, with no changes made by me.

You can find the main program file and the header file attached.

When I try to compile the project I have these errors:

  [Linker error] undefined reference to `Stock::Stock(char const*, int, double)'
  [Linker error] undefined reference to `Stock::Stock(char const*, int, double)' 
  [Linker error] undefined reference to `Stock::Stock(char const*, int, double)' 
  [Linker error] undefined reference to `Stock::Stock(char const*, int, double)' 
  [Linker error] undefined reference to `Stock::~Stock()' 
  [Linker error] undefined reference to `Stock::show() const' 
  [Linker error] undefined reference to `Stock::topval(Stock const&) const' 
  [Linker error] undefined reference to `Stock::show() const' 
  [Linker error] undefined reference to `Stock::~Stock()' 
  [Linker error] undefined reference to `Stock::~Stock()' 
  [Linker error] undefined reference to `Stock::~Stock()' 
  [Linker error] undefined reference to `Stock::~Stock()' 
  ld returned 1 exit status

Can you please help me?
Thank you!

[Daved]

You have to also include stock2.cpp in your project. Do you have that file?

[ferenczi]

Now got it and included. It works.

THANK YOU