Question

Which of the Boolean expressions below are incorrectly written? ( 3 answers). Please note that you are only looking at the correctness of the syntax, not the solution to any specific problem.

	a.	(-10 < x <0)
	b.	True and 3 => 4
	c.	(x > 0) or (x < 0)
	d.	(x != 0) or (x=0)
	e.	!(x >0) and (x >0)

Answer 1

a,b and d are incorrectly written.

The common comparison operator used in boolean expression are:
!=,
>
<
>=
<=

All these operator operate on 2 operands.

a) (-10 < x <10 )
Not a valid boolean expression. Valid one is ( -10 < x ) and ( x < 10 )
  
b) True and 3 => 4
" => " not a boolean operator. Valid one is >=.

d) (x != 0) or (x = 0)
"=" not a a boolean comparison operator. Valid one is ==.

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