/in/foo.cc:16:15: error: stray '\357' in program
     cout<<days；
               ^
/in/foo.cc:16:16: error: stray '\274' in program
     cout<<days；
                ^
/in/foo.cc:16:17: error: stray '\233' in program
     cout<<days；
                 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:13:22: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if(year%4==0 && year%100!=0 || year%400==0)
            ~~~~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc:17:5: error: expected ';' before 'return'
     return 0;
     ^~~~~~