/in/foo.cc: In function 'int main()':
/in/foo.cc:18:11: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<max;
           ^
/in/foo.cc:5:14: warning: 'maxab' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int a,b,max,maxab;
              ^~~~~