foo.cc: In function 'int main()':
foo.cc:17:20: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
   17 |         printf("%.2f",sum/n);
      |                 ~~~^  ~~~~~
      |                    |     |
      |                    |     int
      |                    double
      |                 %.2d

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