/in/foo.cc: In function 'int main()':
/in/foo.cc:11:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(((year%4==0&&year%100!=0&&op==2||year%400==0&&op==2)))
       ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
/in/foo.cc:13:45: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  else if(year%4==0&&year%100==0&&year%400!=0&&op==2||year%4!=0&&op==2)
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~