/in/foo.cc: In function 'int main()':
/in/foo.cc:23:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
             if(year%4==0 && year%100!=0||year%400==0)
                ~~~~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc:27:13: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
             else cout<<"28"<<endl;break;
             ^~~~
/in/foo.cc:27:35: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
             else cout<<"28"<<endl;break;
                                   ^~~~~