foo.cc: In function 'int main()':
foo.cc:8:14: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
    8 |   printf("%.2f",a);
      |           ~~~^  ~
      |              |  |
      |              |  int
      |              double
      |           %.2d

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