Visual Basic 2008 Tutorial

Lesson 15: Functions Part IV- Formatting Functions

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In Visual Basic 2008, we can write code to customize the look of the output so that it can be more easily understood and readable by the users.

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The function to customize the output is the Format function , a very powerful  function which can display numeric values in various forms. There are two types of Format functions, one of them is the built-in or predefined format while another one can be defined by the users.

(i) The syntax of the predefined Format function is

Format (n, ¡°style argument¡±)

where n is the number to be displayed and style argument is the style of the displayed number .

Style arguments are listed  in Table 15.1.

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Table 15.1 List of style arguments

Style argument

Explanation

Example

General Number

To display the number without having separators between thousands.

 

Format(8972.234, ¡°General Number¡±)=8972.234

Fixed

To display the number without having separators between thousands and rounds it up to two decimal places.

 

Format(8972.2, ¡°Fixed¡±)=8972.23

Standard

To display the number with separators or separators between thousands and rounds it up to two decimal places.

 

Format(6648972.265, ¡°Standard¡±)= 6,648,972.27

Currency

To display the number with the dollar sign in front, has separators between thousands as well as rounding it up to two decimal places.

 

Format(6648972.265, ¡°Currency¡±)= $6,648,972.27

Percent

Converts the number to the percentage form and displays a % sign and rounds it up to two decimal places.

 

Format(0.56324, ¡°Percent¡±)=56.32 %

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Example 15.1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click, Button5.Click, Button4.Click, Button3.Click
Label1.Text = Format(8972.234, "General Number")
Label2.Text = Format(8972.2, "Fixed")
Label3.Text = Format(6648972.265, "Standard")
Label4.Text = Format(6648972.265, "Currency")
Label5.Text = Format(0.56324, "Percent")
End Sub

The Output window is shown below:


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(ii) The syntax of the user-defined Format function is

Format (n, ¡°user¡¯s format¡±)

Although it is known as user-defined format, we still need to follows certain formatting styles. Examples of user-defined formatting style are listed in Table 15.2

 

Table15.2: User-Defined format

Example

Explanation

Output

Format(781234.57,¡±0¡±)

Rounds to whole number without separators between thousands.

781235

Format(781234.57,¡±0.0¡±)

Rounds to 1 decimal place without separators between thousands.

781234.6

Format(781234.576,¡±0.00¡±)

Rounds to 2 decimal places without separators between thousands.

781234.58

Format(781234.576,¡±#,##0.00¡±)

Rounds to 2 decimal places with separators between thousands.

781,234.58

Format(781234.576,¡±$#,##0.00¡±)

Shows dollar sign and rounds to 2 decimal places with separators between thousands.

$781,234.58

Format(0.576,¡±0%¡±)

Converts to percentage form without decimal places.

58%

Format(0.5768,¡±0.00%¡±)

Converts to percentage form with 2 decimal places.

57.68%

          Example 15.2

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click, Button5.Click, Button4.Click, Button3.Click
Label1.Text = Format(8972.234, "0.0")
Label2.Text = Format(8972.2345, "0.00")
Label3.Text = Format(6648972.265, "#,##0.00")
Label4.Text = Format(6648972.265, "$#,##0.00")
Label5.Text = Format(0.56324, "0%")
End Sub

The Output window is shown in the diagram below:

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