Visual Basic Scripting Edition
Randomize StatementSee Also
Rnd Function | Timer Function
Requirements
Version 1
[This topic is part of a beta release and is subject to change in future
releases. Blank topics are included as placeholders.]
Initializes the random-number generator.
Randomize [number]
The number argument can be any valid numeric expression.
Remarks
Randomize uses number to initialize the Rnd function's random-number
generator, giving it a new seed value. If you omit number, the value
returned by the system timer is used as the new seed value.
If Randomize is not used, the Rnd function (with no arguments) uses the same
number as a seed the first time it is called, and thereafter uses the last
generated number as a seed value.
Note To repeat sequences of random numbers, call Rnd with a negative
argument immediately before using Randomize with a numeric argument. Using
Randomize with the same value for number does not repeat the previous
sequence.
The following example illustrates use of the Randomize statement.
Dim MyValue, Response
Randomize ' Initialize random-number generator.
Do Until Response = vbNo
MyValue = Int((6 * Rnd) + 1) ' Generate random value between 1 and 6.
MsgBox MyValue
Response = MsgBox ("Roll again? ", vbYesNo)
Loop
Requirements
Version 1
See Also
Rnd Function | Timer Function
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Visual Basic for Applications Reference
Rnd Function
Returns a Single containing a random number.
Syntax
Rnd[(number)]
The optional number argument is a Single or any valid numeric expression.
Return Values
If number is Rnd generates
Less than zero The same number every time, using number as the seed.
Greater than zero The next random number in the sequence.
Equal to zero The most recently generated number.
Not supplied The next random number in the sequence.
Remarks
The Rnd function returns a value less than 1 but greater than or equal to
zero.
The value of number determines how Rnd generates a random number:
For any given initial seed, the same number sequence is generated because
each successive call to the Rnd function uses the previous number as a seed
for the next number in the sequence.
Before calling Rnd, use the Randomize statement without an argument to
initialize the random-number generator with a seed based on the system
timer.
To produce random integers in a given range, use this formula:
Int((upperbound - lowerbound + 1) * Rnd + lowerbound)
Here, upperbound is the highest number in the range, and lowerbound is the
lowest number in the range.
Note To repeat sequences of random numbers, call Rnd with a negative
argument immediately before using Randomize with a numeric argument. Using
Randomize with the same value for number does not repeat the previous
sequence.
