Is not is a mathematical operator of qbasic?

In QBasic, "NOT" is a logical operator used to invert the truth value of a Boolean expression. If the expression evaluates to true, applying the NOT operator will make it false, and vice versa. It is often used in conditional statements to control the flow of the program based on the negation of a condition. However, "IS NOT" is not a recognized operator in QBasic; instead, "NOT" is used for negation.