Concept
Operator Precedence
Description
This section describes the order in which operators are executed in an expression that has two or more operators.
Notes
Operator Precedence determines the order in which operators execute when there is more than one operator in an expression. For example, the expression:
5 + 2 / 3
contains both the division and addition operators. It matters whether the division or the addition takes place first. You can force a particular precedence via parentheses. By default, division has precedence over addition, so this expression would evaluate as 5 plus 2/3. You can force it to do the addition first by writing:
(5 + 2) / 3
It is easy to be confused (especially if you have a mathematical background). The following produces what might be an unexpected result:
4 ^ 2 = 16
To get the expected result use:
(4) ^ 2 = 16
The order from highest precedence to lowest is shown in the following table:
Operator 
Description 

. 
Dot operator 
Delegate creation operator 

Object comparison operators 

Exponentiation operator 

Negation or the unary minus operator 

Logical not operator 

Multiplication and division arithmetic operators 

Subtraction and addition arithmetic operators 

Comparison operators 

Bitwise and logical operator 

Bitwise and logical operator 

Pair creation operator 
If there is more than one operator in an expression with the same precedence, they are evaluated in lefttoright order (left associative) in the expression. For example:
Var number As Integer
number = 5 / 100 * 255
' number = 12
All operators are leftassociative except for pairs (:) and exponentiation (^).
Left associative means that (foo or bar or baz) will evaluate like ((foo or bar) or baz) instead of (foo or (bar or baz)). Conversely, right associative means that (foo : bar : baz) will evaluate like (foo : (bar : baz)) instead of ((foo : bar) : baz).
Shortcircuit evaluation
When used within an If..Then statement, once the first expression results to False, none of the subsequent expressions are evaluated. In this example, the IsValid method is not called because the first expression is False. This is referred to as shortcircuit evaluation:
Var b As Boolean = False
If b And IsValid("value") Then ' IsValid does not get called
...
End If
Compatibility
All project types on all supported operating systems.