/in/foo.cc: In function 'int main()':
/in/foo.cc:44:23: warning: 'n[3]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<n[1]<<n[2]<<n[3]<<endl;
                       ^
/in/foo.cc:44:17: warning: 'n[2]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<n[1]<<n[2]<<n[3]<<endl;
                 ^
/in/foo.cc:44:11: warning: 'n[1]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<n[1]<<n[2]<<n[3]<<endl;
           ^