Microsoft KB Archive/155696

= ACC: How to Round a Number Up or Down by a Desired Increment =

Article ID: 155696

Article Last Modified on 1/19/2007

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APPLIES TO


 * Microsoft Access 1.0 Standard Edition
 * Microsoft Access 1.1 Standard Edition
 * Microsoft Access 2.0 Standard Edition
 * Microsoft Access 95 Standard Edition
 * Microsoft Access 97 Standard Edition

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This article was previously published under Q155696



Moderate: Requires basic macro, coding, and interoperability skills.



SUMMARY
This article shows you how to create a procedure that rounds a number up or down by a specified increment. For example, given the number 3.23, rounding to the nearest .05 results in the number 3.25. The procedure in this article accepts any positive rounding increment as a parameter. In addition to rounding numbers to the nearest fractional amount, you can also round to whole numbers, such as 1, 10, or 100.

This article assumes that you are familiar with Visual Basic for Applications and with creating Microsoft Access applications using the programming tools provided with Microsoft Access. For more information about Visual Basic for Applications, please refer to your version of the "Building Applications with Microsoft Access" manual.

NOTE: Visual Basic for Applications is called Access Basic in Microsoft Access versions 1.x and 2.0. For more information about Access Basic, please refer to the "Introduction to Programming" manual in Microsoft Access version 1.x or the "Building Applications" manual in Microsoft Access version 2.0



MORE INFORMATION
The following example creates a procedure called RoundToNearest, which accepts three parameters:   Parameter     Value -    -   Amt           The numeric value you want to round RoundAmt     The increment to which Amt will be rounded Direction    Constant indicating which direction to round (up or down) For example, RoundToNearest(3.33, 0.1, vb_roundup) returns the value 3.4.   Create a module and type the following lines in the Declarations section: Option Explicit Public Const vb_roundup = 1 Public Const vb_rounddown = 0 NOTE: In versions 1.x and 2.0, use the word "Global" instead of "Public."   Create the following procedure.

NOTE: In the following sample code, an underscore (_) at the end of a line is used as a line-continuation character. Remove the underscore from the end of the line when re-creating this code in Access Basic. Function RoundToNearest (Amt As Double, RoundAmt As Variant, _                              Direction As Integer) As Double On Error Resume Next Dim Temp As Double Temp = Amt / RoundAmt If Int(Temp) = Temp Then RoundToNearest = Amt Else If Direction = vb_rounddown Then Temp = Int(Temp) Else Temp = Int(Temp) + 1 End If           RoundToNearest = Temp * RoundAmt End If     End Function  To test this function, type each of the following lines in the Debug window (or Immediate window in 1.x and 2.0), and then press ENTER.

?RoundToNearest(1.36, 0.25, vb_roundup)

Note that the procedure returns 1.5.

?RoundToNearest(1.36, 0.05, vb_rounddown)

Note that the procedure returns 1.35.

?RoundToNearest(1.36, 0.75, vb_roundup)

Note that the procedure returns 1.5, which is two increments of 0.75.

NOTE: To use the above function in the ControlSource property of a control on a form, you will need to replace the constants vb_roundup and vb_rounddown with their integer values.

