foo.cc: In function 'int main()':
foo.cc:9:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'double' [-Wformat=]
    9 |         if(k==0)printf("%d",a);
      |                         ~^  ~
      |                          |  |
      |                          |  double
      |                          int
      |                         %f

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