/in/foo.cc:5:11: warning: missing terminating " character
     cout<<"10+20=30”;
           ^
/in/foo.cc:5:11: error: missing terminating " character
     cout<<"10+20=30”;
           ^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:6:2: error: expected primary-expression before 'return'
  return 0;
  ^~~~~~