foo.cc: In function 'int main()':
foo.cc:10:17: warning: unused variable 'x' [-Wunused-variable]
   10 |  int year,month,x;
      |                 ^
foo.cc: In function 'int DaysOfMonth(int, int)':
foo.cc:71:1: warning: control reaches end of non-void function [-Wreturn-type]
   71 | }
      | ^

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