Which operator would you use to perform logical OR?

Which operator would you use to perform logical OR?

• A. &&
• B. |
• C. !
• D. ||

Answer: (D)

Logical OR is the || operator. It evaluates to true if at least one of its operands is true, which is exactly what you want when you want to proceed if either condition holds. It also short-circuits, meaning if the left side is true, the right side isn’t evaluated—this can matter when the right side has side effects or is expensive to compute. The other operators do different things: the && operator is logical AND, which only yields true if both sides are true; the ! operator is logical NOT, which negates a single boolean; and the single bar | is typically a bitwise OR, operating on bit patterns rather than booleans and not used for normal boolean logic in conditionals.

Logical OR is the || operator. It evaluates to true if at least one of its operands is true, which is exactly what you want when you want to proceed if either condition holds. It also short-circuits, meaning if the left side is true, the right side isn’t evaluated—this can matter when the right side has side effects or is expensive to compute.

The other operators do different things: the && operator is logical AND, which only yields true if both sides are true; the ! operator is logical NOT, which negates a single boolean; and the single bar | is typically a bitwise OR, operating on bit patterns rather than booleans and not used for normal boolean logic in conditionals.