/in/foo.cc: In function 'int main()':
/in/foo.cc:6:30: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
  if(month==1||month==3||month==5|month==7||month==8||month==10||month==12) day=31;
                         ~~~~~^~~
/in/foo.cc:9:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(year%4==0&&year%100!=0||year%400==0)day=29;
      ~~~~~~~~~^~~~~~~~~~~~~