foo.cc: In function 'int main()':
foo.cc:11:30: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   11 |  if(year%400==0 || year%4==0 && year%100!=0)
      |                    ~~~~~~~~~~^~~~~~~~~~~~~~
foo.cc:39:45: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   39 |  if(year%400==0 || year%4==0 && year%100!=0 && month>2)
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~

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