HP 39gII User Manual page 286

Relational
expressions
==
<
(or < =)
>
(or > =)
(or <> or !=)
Boolean
expressions
AND (or &&)
OR (or ||)
276
Equality.
Syntax: object1 == object2
Example: 3+1== 4 returns 1.
Less than.
Syntax: object1 < object2
Example: 3+1 < 4 returns 0.
Less than or equal to.
Syntax: object1
Example: 3+1
Greater than.
Syntax: object1 > object2
Example: 3+1 > 4 returns 0.
Greater than or equal to.
Syntax: object1
Example: 3+1
Not equal to.
Syntax: object1
Example: 3+1
Logical And.
Syntax: expr1 AND expr2
Example: 3+1==4 AND 4 < 5 returns 1.
Logical Or.
Syntax: expr1 OR expr2
Example: 3+1==4 OR 8 < 5 returns 1.
object2
4 returns 1.
object2
4 returns 1.
object2
4 returns 0.
Programming