Linker Error:Undefined Symbol ATM_c::run() in module Project.cpp

[KBSethna]

Linker Error:Undefined Symbol ATM_c::run() in module Project.cpp
Linker Error:Undefined Symbol ATM_c::ATM_c() in module Project.cpp


ATM_c is a class having a function run() and a constructor.
Declared in .h file and defined in .cpp file.
When I call it in main through the code

main
{
....
....
ATM_c atm;
atm.run();
....
....
}

it gives the above two errors.
Can someone please help with this...

[Banfa]

Sounds like you haven't linked the object created by compiling ATM_c.cpp.

When you have more than 1 cpp file you have to compile each file individually to produce and object file for each and then link all those objects, together with an relevant libraries into an executable.

You would get your error if you compiled and linked main.cpp without ATM_c.cpp

If you are using an IDE it should sort all this out for you.