Geant4 User's Guide for Application Developers - Geant4 - CERN

Getting Started with Geant4- Running a Simple ExampleExample 2.2. An example of main() using interactive terminal and visualization. Codemodified from the previous example are shown in blue.#include "G4RunManager.hh"#include "G4UImanager.hh"#include "G4UIExecutive.hh"#include "G4VisExecutive.hh"#include "N02DetectorConstruction.hh"#include "N02PhysicsList.hh"#include "N02PrimaryGeneratorAction.hh"#include "N02RunAction.hh"#include "N02EventAction.hh"#include "N02SteppingAction.hh"#include "g4templates.hh"int main(int argc,char** argv){// construct the default run managerG4RunManager * runManager = new G4RunManager;// set mandatory initialization classesN02DetectorConstruction* detector = new N02DetectorConstruction;runManager->SetUserInitialization(detector);runManager->SetUserInitialization(new N02PhysicsList);// visualization managerG4VisManager* visManager = new G4VisExecutive;visManager->Initialize();// set user action classesrunManager->SetUserAction(new N02PrimaryGeneratorAction(detector));runManager->SetUserAction(new N02RunAction);runManager->SetUserAction(new N02EventAction);runManager->SetUserAction(new N02SteppingAction);// get the pointer to the User Interface managerG4UImanager* UImanager = G4UImanager::GetUIpointer();if(argc==1)// Define (G)UI terminal for interactive mode{G4UIExecutive * ui = new G4UIExecutive(argc,argv);UImanager->ApplyCommand("/control/execute prerun.g4mac");ui->sessionStart();delete ui;}else// Batch mode{G4String command = "/control/execute ";G4String fileName = argv[1];UImanager->ApplyCommand(command+fileName);}// job terminationdelete visManager;delete runManager;}return 0;2.1.5. G4cout and G4cerrAlthough not yet included in the above examples, output streams will be needed. G4cout and G4cerr are iostreamobjects defined by Geant4. The usage of these objects is exactly the same as the ordinary cout and cerr, except thatthe output streams will be handled by G4UImanager. Thus, output strings may be displayed on another windowor stored in a file. Manipulation of these output streams will be described in Section 7.2.4. These objects shouldbe used instead of the ordinary cout and cerr.5