foo.cc: In function 'int main()':
foo.cc:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lf%lf%lf%lf%d",
  ~~~~~^~~~~~~~~~~~~~~~~~~
   &d1,&c,&d2,&(p[0]),&n);
   ~~~~~~~~~~~~~~~~~~~~~~
foo.cc:13:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lf%lf",&(d[i]),&(p[i]));
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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