foo.cc: In function ‘int year(int)’:
foo.cc:5:15: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
    5 | return (y%4==0&&y%100!=0||y%400==0)?1:0;
      |         ~~~~~~^~~~~~~~~~
foo.cc: In function ‘int year3(int, int, int, int)’:
foo.cc:36:1: warning: no return statement in function returning non-void [-Wreturn-type]
   36 | }
      | ^

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