foo.cc: In function 'int main()':
foo.cc:14:13: warning: format '%f' expects argument of type 'double', but argument 2 has type 'double*' [-Wformat=]
   14 |  printf("%.2f\n", &s);
      |          ~~~^     ~~
      |             |     |
      |             |     double*
      |             double

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