The -- operator
A) is a unary operator.
B) subtracts one from the value of its operand.
C) must have an lvalue, such as a variable, as its operand.
D) can be used in either prefix or postfix mode.
E) All of the above are True.

Question

Quizplus · Accepted Answer

All of the above options are true. 
A) The -- operator is a unary operator as it operates on a single operand.
B) The -- operator subtracts one from the value of its operand.
C) The -- operator must have an lvalue, such as a variable, as its operand. This is because it modifies the value of the operand, which can only be done to an lvalue.
D) The -- operator can be used in either prefix or postfix mode, i.e., --a or a--.

The -- Operator