foo.cc: In function 'int main()':
foo.cc:24:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %lf",&n,&R);
  ~~~~~^~~~~~~~~~~~~~~~
foo.cc:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lf%lf",&data[i].x,&data[i].y);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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