foo.cc: In function 'int main()':
foo.cc:24:19: warning: 'max2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<max1<<" "<<max2<<endl;
                   ^~~~
foo.cc:24:14: warning: 'max1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<max1<<" "<<max2<<endl;
              ^~~