foo.cc: In function 'int main()':
foo.cc:26:14: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
   26 |  printf("%.2lf",s/n);
      |          ~~~~^  ~~~
      |              |   |
      |              |   int
      |              double
      |          %.2d

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