How to draw circle

Dear rooters,
  I am trying to draw a circle using the attached script. But, I am getting an ellipse (the figure is attached). Could you please let me know where I am committing the mistake ?

Thanks,
manoj

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Manoj Kumar Jha 
Research Scholar
Department of Physics & Astrophysics
University of Delhi | Delhi - 110 007 | India
Phone : 91-11-27667036(O) 
E-mail: Manoj.Jha_at_cern.ch
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text/x-c++ attachment: try.C__charset_



application/postscript attachment: figure.ps