Rnd Function
Returns a Single containing a random number.
Syntax
Rnd[(number)]
The optional numberargument 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.
Example
Note Examples that follow demonstrate the use of this function in a Visual Basic for Applications (VBA) module. For more information about working with VBA, select Developer Reference in the drop-down list next to Search and enter one or more terms in the search box.
This example uses the Rnd function to generate a random integer value from 1 to 6.
Dim MyValue
' Generate random value between 1 and 6.
MyValue = Int((6 * Rnd) + 1)