foo.cc: In function 'int main()':
foo.cc:43:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lf%d",&S,&n);
  ~~~~~^~~~~~~~~~~~~~~
foo.cc:48:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lf",&s);
   ~~~~~^~~~~~~~~~

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