/in/foo.cc:28:31: warning: multi-character character constant [-Wmultichar]
   cout<<'('<<maxa<<','<<maxb<<') '<<'('<<maxc<<','<<maxd<<')'<<endl;
                               ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:28:53: warning: 'maxd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   cout<<'('<<maxa<<','<<maxb<<') '<<'('<<maxc<<','<<maxd<<')'<<endl;
                                                     ^
/in/foo.cc:28:42: warning: 'maxc' may be used uninitialized in this function [-Wmaybe-uninitialized]
   cout<<'('<<maxa<<','<<maxb<<') '<<'('<<maxc<<','<<maxd<<')'<<endl;
                                          ^
/in/foo.cc:28:25: warning: 'maxb' may be used uninitialized in this function [-Wmaybe-uninitialized]
   cout<<'('<<maxa<<','<<maxb<<') '<<'('<<maxc<<','<<maxd<<')'<<endl;
                         ^
/in/foo.cc:28:14: warning: 'maxa' may be used uninitialized in this function [-Wmaybe-uninitialized]
   cout<<'('<<maxa<<','<<maxb<<') '<<'('<<maxc<<','<<maxd<<')'<<endl;
              ^