Can anyone help me how to remove these errors while debugging a c++ file

[Shriansh]

Re: [Makefile error in QT "Makefile Error 3"](/topic/135203/makefile-error-in-qt-makefile)-error-3)

[JonB]

@Shriansh
You either have not put the QOBJECT macro in the calculator class declaration, or have not re-run the build from scratch since you did (including qmake). calculator.h even has unsaved changes....

[Shriansh]

@JonB I didn't get it... Where is the error ? And what I have to do to correct it , please tell me for I'm indulged over it for an hour

[JonB]

@Shriansh
There is (probably) no error in your code. calculator.h has unsaved changes so goodness knows what that might have in it. I said you need to (save that and) do a complete rebuild. Assuming you know where the build output directory is, delete it or all files in it. Not your source directory!

[Shriansh]

@JonB there is still two errors coming... 😢

[JonB]

@Shriansh
The error message from the linker tells you what method is called somewhere but not defined anywhere. Neither of your screenshots show where it is defined.

[Shriansh]

@JonB after debugging another.cpp program "moc_calculator.cpp" gets built on its own and their it is showing alot of errors ...

[Christian Ehrlicher]

@Shriansh As already told you by @JonB you forgot to implement this function so the linker can not find it.