/in/foo.cc: In function 'int main()':
/in/foo.cc:20:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if(year%4==0&&year%100!=0||year%400==0)
            ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc:24:9: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
         else cout<<"28"<<endl;break;
         ^~~~
/in/foo.cc:24:31: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
         else cout<<"28"<<endl;break;
                               ^~~~~