Is $z TRUE or FALSE?In this case, $z will be FALSE because the above code is equivalent to 
      rather than 
      as might be expected - because the OR operator has lower precedence than assignment operators.On the other hand, after this code sequence:
     $z will be TRUE, as expected, because the || operator has higher precedence than assignment:  The code is equivalent to $z=($y OR $x).This is why you should NEVER use the OR operator without explicit parentheses around the expression where it is being used.