[Ilugc] help in calculator application in c (gtk)

[Aravindhan.K]

     I am trying to write a gtk c program for a simple calculator. A 
segmentation fault occurs
and I am not able to get the reason.
The pastebin address for the code is http://pastebin.com/EkrwD3f2.
     Please give me the steps for how to debug the segmentation faults.
Thanking you.
Aravindhan .K
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