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Question My program doesn't output anything  

Forum: Documentation and Examples
Date: 24 Feb, 2011
From: Tim Hodson <Tim Hodson>

Greetings friends,

I have been learning c++ and GEANT4 for a while now and developing a prototype program for a research group in radiation oncology. It is absolutely basic. I have merely defined a cube filled with water inside some mother volume. At the centre is a source of 100keV gamma rays. I have declared and defined my three mandatory classes (ie Detector, physics and primarygeneration).

My main() is very similar to that in novice example 1. However, while this example spits out all sorts of information in the cygwin window which gets written to an out file the only output I get is:

Geant4 version $Name: geant4-09-03-patch-01 $   (9-April-2010)
Copyright : Geant4 Collaboration
Reference : NIM A 506 (2003), 250-303
	WWW :

and nothing else.

Is this because my simulation is more complicated (ie it has secondary particles/more processes)? Do I need a G4event(Action) or tracking or stacking object? Do I just need to make my geometry a sensitive detector?

I would like the sort of output that is spat out with novice example 2 and this program has eventaction/runaction objects and a stacking mechanism. Do I need these for the simulation described above? But if that is the case why doesn't novice example 1 need them to produce an output? Basically I want to know

1)why nothing is being output by my program? 2)what more do I have to add to my program so it does produce an output?

I will attach a copy of my main.

I have been using all the online resources for teaching myself but mostly they seem to start from a higher starting point and don't address these basic questions. So I have to annoy all of you lovely people who have been so helpful. Thanking all you excellent persons in advance. Tim


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1 None: Re: My program doesn't output anything   (Marc Verderi - 24 Feb, 2011)
(_ More: Re: My program doesn't output anything   (Tim Hodson - 25 Feb, 2011)
(_ None: Re: My program doesn't output anything   (Marc Verderi - 25 Feb, 2011)
(_ More: Re: My program doesn't output anything   (Tim Hodson - 26 Feb, 2011)
(_ Sad: Re: My program doesn't output anything   (Tim Hodson - 09 Mar, 2011)
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