SignalSlot Communication

connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(pushButton_Clicked())); With this syntax, the button clicked() signal will be received by MainWindow

The signal and slot specifications should have the argument types, but not the arguments themselves Get Application Development with Qt Creator

signal and slot in qt To use signals and slots for implementing loose coupling, it must be easy to connect signals and slots that only partially match signatures

signal slot connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(pushButton_Clicked())); With this syntax, the button clicked() signal will be received by MainWindow