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Rnd

Using the Rnd Function

In this tutorial you will learn how to use the Rnd Function.

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.

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.

In this example we won't pass a value.

The result is a random number.

The results using a Query would be

	SELECT Rnd();
	

In a Form you could set the Default Value of a Textbox to

	=Rnd()
	

In a Form add a TEXTBOX control and rename it "txtRnd", then you could add the following in the Load Event.

	Private Sub Form_Load()
		txtRnd = Rnd()
	End Sub
	

Access Expert 26

See this FREE Tip on Rnd.

You can find more about this by searching the website.

By: Alex Hedley

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