/in/foo.cc: In function 'int main()':
/in/foo.cc:28:52: warning: 'maxd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   cout<<'('<<maxa<<','<<maxb<<')'<<'('<<maxc<<','<<maxd<<')'<<endl;
                                                    ^
/in/foo.cc:28:41: 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;
              ^