How can I connect signals and slots of different objects in Qt?

Question

i have a doubt in QT c++

Suppose this is the main.cpp

#include \"head.h\"
#include \"tail.h\"

int main()
{
  head *head_obj = new head();
  tail *ta         


        

Answer 1

Well, assuming everything is as simple as you show it your really really abbriated code, it should be simple

connect( aTailInstance->tailButon, SIGNAL( clicked() ), aHeadInstance, SLOT( change_number() ) );

However, with the code you have shown here it is impossible to determine what kind of functionality you are after and it isn't clear exactly what you are asking.