Which vb expression is the same as a=a 1

Logical and Bitwise Operators in Visual Basic combine Boolean or numeric values and return a result of the same data type as the values. The value elements that are combined with an operator are called operands of that operator.

Operators combined with value elements form expressions, except for the assignment operator, which forms a statement. For more information, see Statements.

The end result of an expression represents a value, which is typically of a familiar data type such as Boolean , String , or a numeric type. Several operators can perform actions in a single expression or statement, as the following example illustrates.

There is no practical limit to the number of operators that can be combined into an expression, but an understanding of Operator Precedence in Visual Basic is necessary to ensure that you get the results you expect.

Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. They work identically. Both reverse the logical meaning of the expression following the!

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Is there a VB. Ask Question. Asked 13 years ago. Active 3 years, 9 months ago. Viewed 18k times. In C , I can do a short hand testing for null or false value on a string variable like this: if! IsNullOrEmpty blah then Scott Dorman Jack Jack 9, 22 22 gold badges 76 76 silver badges bronze badges. Add a comment. Active Oldest Votes. But note that the VB Not keyword is actually overloaded to represent two C equivalents: logical negation:! Neuron 4, 4 4 gold badges 24 24 silver badges 47 47 bronze badges.

Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. These operators compare two expressions to determine whether or not they are equal, and if not, how they differ. Is , IsNot , and Like are discussed in detail on separate Help pages. The relational comparison operators are discussed in detail on this page. A Boolean value representing the result of the comparison. The following table contains a list of the relational comparison operators and the conditions that determine whether result is True or False.

The Is operator, the IsNot operator, and the Like operator have specific comparison functionalities that differ from the operators in the preceding table. When you compare an expression of type Single to one of type Double , the Single expression is converted to Double. This behavior is opposite to the behavior found in Visual Basic 6. Similarly, when you compare an expression of type Decimal to an expression of type Single or Double , the Decimal expression is converted to Single or Double.

For Decimal expressions, any fractional value less than 1E might be lost. Such fractional value loss may cause two values to compare as equal when they are not. It is safer to test whether the absolute value of the difference between the two numbers is less than a small acceptable tolerance. When you work with floating-point numbers, keep in mind that they do not always have a precise representation in memory.

This could lead to unexpected results from certain operations, such as value comparison and the Mod Operator. For more information, see Troubleshooting Data Types.

When you compare strings, the string expressions are evaluated based on their alphabetical sort order, which depends on the Option Compare setting.