Operators
are symbols (characters or keywords) that specify operations to be
performed on one or two
operands
(or
arguments
).
Operators that take one operand are called unary operators. Operators that take two operands are called
binary operators. Unary operators use
prefix notation
, meaning that the operator precedes
the operand (e.g., 5
). Binary operators (except
for one case) use infix notation
, meaning that the operator is between
the operands (e.g., 1
+
2
). The TypeOf...Is
operator is
a binary operator that uses a special form that is neither prefix nor
infix notation.
Visual Basic supports the following unary operators:
+
(unary plus)The unary plus operator takes any numeric operand. It’s not of much practical use because the value of the operation is equal to the value of the operand.

(unary minus)The unary minus operator takes any numeric operand (except as noted later). The value of the operation is the negative of the value of the operand. In other words, the result is calculated by subtracting the operand from zero. If the operand type is Short, Integer, or Long, and the value of the operand is the maximum negative value for that type, then applying the unary minus operator will cause a System.OverflowException error, as in the following code fragment:
Dim sh As Short = 32768 Dim i As Integer = sh
Not
(logical negation)The logical negation operator takes a Boolean operand. The result is the logical negation of the ...
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