Vba excel что такое boolean

VBA Boolean data type can only be either TRUE or FALSE – expressed either as “1” (TRUE) or “0” (FALSE).

Boolean values are commonly used with IF statements to verify whether a given condition is met or not, allowing you to build complex logical comparisons.

A blank canvas in the VBA editor is waiting for us, so let’s get started.

Declaring Boolean Variables

First things first, let’s start with declaring Boolean variables so that you can use them in your VBA code.

There are two ways to declare a Boolean variable: 

• on the module level, meaning the variable can only be used within a given module
• on the global level, meaning the variable can be used across the entire VBA project

Use the following Dim statement to create a Boolean value on the module level:

Dim BooleanValue As Boolean

On the other hand, copy this public statement to create a global Boolean variable:

Public BooleanValue As Boolean

Example #1: Using Boolean Variables

Let’s move from theory to practice.

The examples below demonstrate how to use the Boolean data type in VBA. 

Start with creating a new module (Insert > Module). Once there, copy the following code into the VBA editor and click “Run Sub/UserForm” or press F5 to execute it:

Sub Boolean_Vba()
Dim BooleanValue As Boolean
BooleanValue = 50 > 115
MsgBox BooleanValue
End Sub

This simple Sub procedure compares whether 50 is greater than 115 and returns a message box with the corresponding Boolean value based on this simple logical comparison.

Let’s take a closer look at the VBA code to help you adjust accordingly:

• Dim BooleanValue As Boolean – This line of code creates a new variable named “BooleanValue” and converts it to the Boolean data type.
• BooleanValue = 50 > 115 – This determines the actual Boolean value of the variable based on the specified logical comparison. If 50 is greater than 115, the value is set to TRUE. If not, the value is set to FALSE.
• MsgBox BooleanValue – This VBA command creates a message box containing the output.

Predictably, VBA returns FALSE since 50 is not greater than 115.

Related Article: How to Change The Position And Size Of Excel Charts In VBA

Example #2: Boolean Variables & IF Statements

That was a simple example, so let’s ramp up the difficulty level and break down how you can use the VBA Boolean data type with IF statements.

Imagine you’re overseeing a web development project where the devs are getting paid based on their hourly rate. Your fictitious company allocated 54 hours to the project. 

Armed with this data (and the knowledge of how to apply Boolean values), you can put together a simple IF statement to check if the project runs over budget at any stage of the development process:

Sub Boolean_Vba()
Dim HoursTracked As Integer
Dim HoursPlanned As Integer
Dim Result As Boolean
HoursTracked = 13
HoursPlanned = 54
If HoursTracked > HoursPlanned Then
    Result = True
Else
    Result = False
End If
    MsgBox "Project cost overrun: " & Result
End Sub

The screenshot below breaks down the building blocks of this Sub procedure in greater detail:

As a result, VBA will return this message box to help you spot any project cost overrun.

Boolean Operators 

In VBA, Boolean operators make it possible for you to work with combinations of Boolean variables, providing you a lot more flexibility.

The four most common Boolean operators in VBA are AND, OR, NOT, and XOR. In this section, we will show you how to use each of them.

The AND Operator

The AND operator connects two or more Boolean expressions and returns TRUE only if all of the conditions are met.

In the example below, the variable “Result” equals TRUE only if both the first condition (50 > 155) and the second condition (50 < 55) are TRUE.

Sub Boolean_Vba()
Dim Result As Boolean
Result = 50 > 155 And 50 < 55 // Use the AND operator to check if both of the conditions are met
MsgBox Result
End Sub

Result: FALSE

The OR Operator

The OR operator returns TRUE if at least one of the conditions is met.

In the same example, the variable “Result” equals TRUE if either the first or second condition is TRUE.

Sub Boolean_Vba()
Dim Result As Boolean
Result = 50 > 155 Or 50 < 55 // Use the OR operator to check if any of the conditions are met
MsgBox Result
End Sub

Result: TRUE

The NOT Operator

The NOT operator turns TRUE into FALSE, and vice versa.

In this example, since 50 is not greater than 155, the VBA editor should return FALSE. However, since the NOT operator is applied, it takes truth to falsity. Another variation is the not-equal-to operator (<>) that works in a similar way.

Sub Boolean_Vba()
Dim Result As Boolean
Result = Not 50 > 155 // Use the NOT operator to reverse the TRUE and FALSE values
MsgBox Result
End Sub

Result: TRUE

The XOR Operator

The XOR operator returns TRUE only if two conditions are not TRUE or FALSE at the same time.

In the example below, the “Result” variable is TRUE because the first condition (50 > 155) is FALSE while the second condition (50 < 55) is TRUE.

Sub Boolean_Vba()
Dim Result As Boolean

Result = 50 > 155 Xor 50 < 55 // Check if BOTH or NEITHER of the conditions are met
MsgBox Result
End Sub

Result: TRUE

Usage Notes

1. The default Boolean value is FALSE.

Sub Boolean_Vba()
Dim Result As Boolean
MsgBox Result
End Sub

Result: FALSE

2. By default, every nonzero number is TRUE.

Sub Boolean_Vba()
Dim Result As Boolean
Result = 15
MsgBox Result
End Sub

Result: TRUE

3. Zero is equal to FALSE.

Sub Boolean_Vba()
Result = 0
MsgBox Result
End Sub

Result: TRUE

4. Boolean values can’t be anything but TRUE or FALSE. If you try to turn a Boolean variable into any other data type, this breaks the code and triggers an error.

Sub Boolean_Vba()
Dim Result As Boolean
Result = “Bird is the word”
MsgBox Result
End Sub

Result: a type-mismatch error – as shown on the screenshot below.

VBA Boolean Data Type (Dim Variable)

In this Article

Boolean Variable Type

The VBA Boolean data type is used to store True or False values. True can also be represented by 1 and False by 0.

To declare an Boolean variable, you use the Dim Statement (short for Dimension):

Then, to assign a value to a variable, you simply use the equal sign:

When you put this in a procedure, it could look like this:

If you run the code above, the following message box will be shown.

Declare Boolean Variable at Module or Global Level

In the previous example, we’ve declared the Boolean variable within a procedure. Variables declared with a procedure can only be used within that procedure.

Module Level

You declare Module level variables at the top of code modules with the Dim statement.

These variables can be used with any procedure in that code module.

Global Level

You also declare Global level variables at the top of code modules. However, instead of using the Dim statement, you would use the Public statement to indicate that the Boolean variable is available to be used throughout your VBA Project.

If you were to declare the Boolean variable at a module level and then try to use it in a different module, you would get an error.

However, if you had used the Public keyword to declare the Boolean variable, the error would not occur and the procedure would run perfectly.

Using a Boolean Variable

You use the Boolean variable in logical comparison. These are often used with If statements to test if a condition is True or False as per the example above, or in a line of code to apply a logical test – perhaps to see if one value is greater than another.

If you run the code above, you will get the following message box.

because of course 45 is not greater than 68!

Using Boolean Operators

As Boolean variables are used in logical comparison, we can use the logical operators AND and OR to test to see if more than one condition is true or false.

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Using the AND operator

We can use the AND function to see if BOTH conditions are met.

or we could run the same test using an If Statement:

Both examples above would return FALSE due to the fact that 10 is NOT greater than 13 – and BOTH conditions have to be True for the Boolean to be True.

Using the OR operator

We can use the OR function to see if ONE OF the conditions is met.

or we could run the same test using an If Statement:

These examples would return TRUE due to the fact that 10 is NOT greater than 13 BUT 15 IS greater than 12 – and ONLY ONE condition has to be True for the Boolean to be True.

Using If statements allows us to use more logical operators

Using the NOT operator

We can also use the NOT operator with the Boolean variable. The NOT operator negates the value of the condition – so if a condition is true, the NOT operator will return false.

Using the Xor Logical Operator

The Xor logical operator is used to compare two or more conditions. If one of the conditions is true, it will return TRUE. If there are 2 conditions, and NEITHER are true or BOTH are true, it will return FALSE.

In the above example, as ONE of the conditions is TRUE, the message box will return TRUE.

However, in the example above, as BOTH conditions are true, the message box will return FALSE.

and finally, as both conditions are FALSE, the message box will also return FALSE.

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Simply navigate to the menu, click, and the code will be inserted directly into your module. .xlam add-in.

Источник

Boolean Data Type in Excel VBA

Boolean Data Type in Excel VBA explained with syntax and examples. We use the Boolean VBA data type to store logical data. The Boolean VBA data type contains only two states of values either TRUE or FALSE. In other words we can also refer as 1 for True and 0 for False. The default value is False. It is most common frequently used VBA data type to represent True or False. It occupies 2 bytes(16 bits) in memory. We can convert number or numeric data type to boolean data type by using CBool VBA conversion function. Here True and False are keywords in VBA. It doesn’t have literal.

Boolean VBA Data Type Syntax in Excel

Let us see Data Type Boolean Syntax in Excel VBA.

Where VariableName represents the name of the variable.
and Boolean represents the type of data.

Example on the Boolean VBA Data Type when value is TRUE

Here is an example on the Boolean VBA Data Type in Excel.

Example on the Boolean VBA Data Type when value is TRUE

Here is an example on the Boolean VBA Data Type in Excel.

Convert an Expression to Boolean VBA Data Type in Excel

You can convert an expression to Boolean VBA data type using VBA CBool function. Click on the following link to learn about CBool function and complete tutorial and examples.

VBA Data Types

Also read about all other data types. VBA Data Types

Instructions to Run VBA Macro Code or Procedure:

You can refer the following link for the step by step instructions.

Other Useful Resources:

Click on the following links of the useful resources. These helps to learn and gain more knowledge.

Источник

Тип данных Boolean (Visual Basic)

Содержит значения, которые могут быть только True или False . Ключевые True слова и False соответствуют двум состояниям переменных Boolean .

Используйте логический тип данных (Visual Basic), чтобы содержать значения двух состояний, такие как true/false, да/нет или вкл./выкл.

Значением свойства Boolean по умолчанию является False .

Boolean значения не хранятся в виде чисел, а сохраненные значения не должны быть эквивалентными числам. Никогда не следует писать код, основанный на эквивалентных числовых значениях и True False . По возможности следует ограничить использование Boolean переменных логическими значениями, для которых они разработаны.

Преобразования типов

При Visual Basic преобразует числовые значения Boolean типов данных в значение 0 False и все остальные значения становятся True . Когда Visual Basic преобразует Boolean значения в числовые типы, False он становится 0 и True становится -1.

При преобразовании между Boolean значениями и числовыми типами данных следует помнить, что методы преобразования платформа .NET Framework не всегда создают те же результаты, что и ключевые слова преобразования Visual Basic. Это связано с тем, что преобразование Visual Basic сохраняет поведение, совместимое с предыдущими версиями. Дополнительные сведения см. в разделе «Логический тип не преобразуется в числовой тип точно» в разделе «Устранение неполадок типов данных».

Советы по программированию

Отрицательные числа. Boolean не является числовым типом и не может представлять отрицательное значение. В любом случае не следует использовать Boolean для хранения числовых значений.

Символы типов. Boolean не имеет символа литерального типа или символа типа идентификатора.

Тип Framework. В .NET Framework данный тип соответствует структуре System.Boolean.

Пример

В следующем примере runningVB это переменная Boolean , в которой хранится простой параметр yes/no.

Источник

VBA Boolean

VBA Boolean Operation

In Excel when we compare two cell contents or numbers by applying equal sign between them, we get output in TRUE or FALSE format. Which means values which we are comparing may be equal or may not be equal. In a similar manner, we have Boolean in VBA Excel. Boolean also gives the output in the form of TRUE or FALSE. Boolean is a form of data type which can only contain either TRUE or FALSE. When we give some input to Boolean and if the test becomes TRUE then we get an answer as TRUE or we get FALSE.

How to Use Boolean in VBA Excel?

Let’s see the examples of Boolean in Excel VBA.

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Example #1 – VBA Boolean

Let’s see a very simple example where we will see how to apply Boolean while comparing some.

Step 1: For that go to the VBA window and click on the Insert menu tab. From the list select a Module as shown below.

Step 2: Now in the opened module, write the sub category of VBA Boolean. We can choose to write any name of subprocedure here.

Code:

Step 3: Now define a Dim with any name, let’ say an A and assign the variable A as Boolean as shown below.

Code:

Step 4: Let’s consider two numbers, 1 and 2. And now we will test with the help of Boolean whether 2 is greater than 1 or not. So in the next line, write a mathematical expression of 1 =) or Less Than-Equal to ( Popular Course in this category