Returns a Single containing a random number.
Rnd[(num)] |
The optional num argument is a Single or any valid numeric expression.
Retun Values
If num is | Rnd() returns |
Less than zero | The same number every time, using num 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. |
The Rnd() function returns a value less than 1 but greater than or equal to zero.
The value of num 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.
This example uses the Rnd function to generate a random integer value from 1 to 6.
Dim MyValue
MyValue = Int((6 * Rnd()) + 1) ' Generate random value between 1 and 6.
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See Also |
Randomize Statement, Timer Function |