Which symbol represents the logical NOT operation?

Which symbol represents the logical NOT operation?

• A. !
• B. &&
• C. ||
• D. =

Answer: (A)

Negation flips a boolean value. The NOT operation takes a true value and makes it false, or a false value and makes it true. In many programming languages, the NOT symbol is the exclamation mark, placed before a boolean expression. For example, if a condition represents something being open, !open means it is not open. This is how you invert a condition in code, like if (!ready) { … } to run when something isn’t ready. The other symbols perform different roles: the AND symbol requires both sides to be true to yield true; the OR symbol yields true if at least one side is true; and the equals/assignment symbol is used for assigning a value or comparing equality, not for negating a truth value. So the exclamation mark is the proper symbol for logical NOT.

Negation flips a boolean value. The NOT operation takes a true value and makes it false, or a false value and makes it true. In many programming languages, the NOT symbol is the exclamation mark, placed before a boolean expression. For example, if a condition represents something being open, !open means it is not open. This is how you invert a condition in code, like if (!ready) { … } to run when something isn’t ready.

The other symbols perform different roles: the AND symbol requires both sides to be true to yield true; the OR symbol yields true if at least one side is true; and the equals/assignment symbol is used for assigning a value or comparing equality, not for negating a truth value. So the exclamation mark is the proper symbol for logical NOT.