foo.cc: In function 'int main()':
foo.cc:8:20: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
    8 |         printf("%.1f",c);
      |                 ~~~^  ~
      |                    |  |
      |                    |  int
      |                    double
      |                 %.1d

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