Recursive algorithm based on a 24-point calculator, enter 4 0-9 integer, the output calculation of all possible 24 points, there is no output NO ANSWER

Debug\cal_24.exe
.....\cal_24.ilk
.....\cal_24.obj
.....\cal_24.pch
.....\cal_24.pdb
.....\cal_24.res
.....\cal_24Dlg.obj
.....\StdAfx.obj
.....\vc60.idb
.....\vc60.pdb
Debug
res\cal_24.ico
...\cal_24.rc2
res
cal_24.aps
cal_24.clw
cal_24.cpp
cal_24.dsp
cal_24.dsw
cal_24.h
cal_24.ncb
cal_24.opt
cal_24.plg
cal_24.rc
cal_24Dlg.cpp
cal_24Dlg.h
ReadMe.txt
resource.h
StdAfx.cpp
StdAfx.h

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