foo.c: In function 'main':
foo.c:18:34: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   18 |                         printf("%d\n",c);
      |                                 ~^    ~
      |                                  |    |
      |                                  int  long long int
      |                                 %lld

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