foo.cc: In function 'int main()':
foo.cc:6:15: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
    6 |  printf("%0.2lf",d);
      |          ~~~~~^  ~
      |               |  |
      |               |  int
      |               double
      |          %0.2d

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