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<%
'**************************************************************************
' CLASS: cRandom
'Calls randomize to seed the random number generator.
'Provides functions for returning ranged random integers or arrays of
'ranged random integers.
'**************************************************************************
class cRandom
' Calling randomize to seed the random number generator at the time the
' class is created seemed like a reasonable thing to do.
private sub Class_Initialize()
' Check the VBScript documentation for the specifics relating
' to the Randomize function
Randomize
end sub
' Terminate doesn't need to do anything for this class
private sub Class_Terminate()
end sub
'**********************************************************************
' FUNCTION:RangedRandom
' PARAMETER:lowerBound, the lowest allowable number to return
' PARAMETER:upperBound, the highest allowable number to return
' RETURNS:A random integer between lowerBound and UpperBound,
'inclusive
'**********************************************************************
public function RangedRandom( lowerBound, upperBound )
RangedRandom = CInt((upperBound - lowerBound) * Rnd + lowerBound)
end function
'**********************************************************************
' FUNCTION: RangedRandomArray
' PARAMETER: lowerBound, the lowest allowable number to return
' PARAMETER: upperBound, the highest allowable number to return
' PARAMETER: arraySize, zero based number specifying the size of the array
' PARAMETER: duplicates, true or false to indicate whether duplicate
' random values are allowed in the array
' RETURNS: A single dimension array sized to match the arraySize
' parameter, containing random integers between lowerBound and
' upperBound, inclusive
'**********************************************************************
public function RangedRandomArray(lowerBound, upperBound, arraySize, duplicates)
dim tempArray()
dim filledElements, tempValue, badValue, i
' resize the tempArray to hold the number of elements passed in the
' arraySize parameter
redim tempArray(arraySize)
' This is a loop counter, set it to 0
filledElements = 0
' loop until filledElements is equal to the arraySize + 1
do until filledElements = arraySize + 1
' Call the RangedRandom function with the lowerBound and upperBoundparameters
tempValue = RangedRandom( lowerBound, upperBound )
' Handle the case where we don't want duplicate values
if duplicates = false then
badValue = false
for i = 0 to UBound(tempArray)
' check if the new random value already exists in the array
' if it does set the badValue flag to true and break out of the loop
if tempValue = tempArray(i) then
badValue = true
exit for
end if
next
if badValue = false then
tempArray(filledElements) = tempValue
filledElements = filledElements + 1
end if
else
' Handle the case where duplicate values in the array are acceptable
tempArray(filledElements) = tempValue
filledElements = filledElements + 1
end if
loop
' return the array
RangedRandomArray = tempArray
end function
end class
%>
<%
' All the code that follows is example code showing the use of the
' cRandom class.
dim objRandom
dim flip
dim randomArray
dim rowsToTest
dim i, j
' create an instance of our class
set objRandom = new cRandom
' set the number of iterations that we want to test
rowsToTest = 10
' "toggle" to determine whether or not we set the bgcolor of the table row
flip = true
' Start the table
Response.Write "<table border=0 cellpadding=1 cellspacing=1>"
for j = 0 to rowsToTest
' We'll alternate the bgcolor of the table rows based on the
' value of the flip variable
if flip then
Response.Write "<tr bgcolor=LightGrey>"
else
Response.Write "<tr>"
end if
' Call the RangedRandomArray function for testing purposes
randomArray = objRandom.RangedRandomArray( 1, 100, 9, false )
' Output the contents of the array
for i = 0 to UBound(randomArray)
Response.Write "<td align=right width=30><font face=Verdana size=1>" & randomArray(i) & "</font></td>"
next
Response.Write "</tr>"
' Toggle the flip boolean variable
flip = not flip
next
' Close the table
Response.Write "</table>"
' Destroy the instance of our object
set objRandom = nothing
%>