What does && mean?

What does && mean?

• A. Logical OR; true when at least one expression is true
• B. Logical AND; true only when both expressions are true
• C. Logical NOT; negates a Boolean expression
• D. Logical XOR; true only when exactly one expression is true

Answer: (B)

&& is the logical AND operator. It takes two boolean expressions and yields true only when both expressions are true. In code, you’ll see it used in conditionals like if (condA && condB) { … }, meaning the block runs only if both condA and condB are true. In many languages, the evaluation is short-circuiting: if the first condition is false, the second isn’t evaluated, which can help avoid errors or unnecessary work. This is different from logical OR (||), which is true if at least one of the expressions is true. It’s also different from logical NOT (!), which negates a single expression. XOR is true only when exactly one of the expressions is true (one true and the other false).

&& is the logical AND operator. It takes two boolean expressions and yields true only when both expressions are true. In code, you’ll see it used in conditionals like if (condA && condB) { … }, meaning the block runs only if both condA and condB are true. In many languages, the evaluation is short-circuiting: if the first condition is false, the second isn’t evaluated, which can help avoid errors or unnecessary work.

This is different from logical OR (||), which is true if at least one of the expressions is true. It’s also different from logical NOT (!), which negates a single expression. XOR is true only when exactly one of the expressions is true (one true and the other false).