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Random Function

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bdavis96

Programmer
Feb 11, 2002
97
US
What is the code for the Random function in VB and can I seed it with time or something decent so it doesn't always repeat itself when you start up the program? Any help would be great.
 
Randomize
number = Int((upperbound - lowerbound + 1) * Rnd + lowerbound)

Randomize causes the rnd() function to call its seed from a timer function. This is the number of seconds since midnight.
 
Did you try a quick search in VBHelp?

See also FAQ referred below.

VB help gives :

Rnd function

Returns a Single containing a random number.

Syntax

Rnd[(number)]

The optional numberargument is aSingle or any validnumeric expression.

Return Values

If number is Rnd generates
Less than zero The same number every time, using number as theseed.
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.

Let me know if this helps
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