foo.c: In function 'main':
foo.c:16:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   16 |                 printf("%d\n",c);
      |                         ~^    ~
      |                          |    |
      |                          int  long long int
      |                         %lld

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