Bookshelf Home | Contents | Index | Search | PDF |
Siebel VB Language Reference > Siebel VB Language Reference >
Null Function
This standard VB function sets a variant variable to the Null value.
Syntax
Null
Returns
A variant value set to NULL.
Usage
Null is used to set a variant variable to the Null value explicitly, as follows:
variableName
=
Null
Note that variants are initialized by Basic to the empty value, which is different from the Null value.
Example
This example asks for ten test score values and calculates the average. If any score is negative, the value is set to Null. Then IsNull is used to reduce the total count of scores (originally 10) to just those with positive values before calculating the average.
Sub Button_Click
Dim arrayvar(10)
Dim count as Integer
Dim total as Integer
Dim x as Integer
Dim tscore as Single
count = 10
total = 0
For x = 1 to count
tscore = 88
If tscore < 0 then
arrayvar(x) = Null
Else
arrayvar(x) = tscore
total = total + arrayvar(x)
End If
Next x
Do While x <> 0
x = x - 1
If IsNull(arrayvar(x)) = -1 then
count = count - 1
End If
Loop
msgtext = " The average (excluding negative values) is: "
msgtext = msgtext & Chr(10) & Format (total/count, "##.##")
End SubSee Also
Bookshelf Home | Contents | Index | Search | PDF |
Siebel VB Language Reference Published: 18 June 2003 |