What happens when altering a compiled code?

If i have a c++ code which already compiled and run in matlab and i alter in the code in .cpp file only, If i need to alter any other files or not and if i need what are these files

Answer 1

[Rik]

Matlab is not running the cpp-file, so altering it has no effect. If you want to change the code that Matlab runs, you will have to re-compile the edited cpp-file to mex.