foo.cc: In function 'int main()':
foo.cc:8:12: warning: format '%d' expects argument of type 'int', but argument 2 has type 'double' [-Wformat=]
    8 | printf("%.1d",b);
      |         ~~~^  ~
      |            |  |
      |            |  double
      |            int
      |         %.1f

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