/in/foo.cc: In function 'int main()':
/in/foo.cc:6:6: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(x<=y<=z)
     ~^~~
/in/foo.cc:6:6: warning: 'x' is used uninitialized in this function [-Wuninitialized]
  if(x<=y<=z)
     ~^~~
/in/foo.cc:6:6: warning: 'y' is used uninitialized in this function [-Wuninitialized]
/in/foo.cc:6:2: warning: 'z' is used uninitialized in this function [-Wuninitialized]
  if(x<=y<=z)
  ^~