Generate a random number

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RayKnight - 29 Apr 2005 06:38 GMT

If I want to generate a random number between a certain number, what might
possibly be the formulae?

Example if I were to make a game, and the minimum damage is 10 and the
maximum is 35. So what might possibly be the formulae to generate a random
number between 10 to 35?

Any help or link is appreciated. Thank you.

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Peter MacMillan - 29 Apr 2005 06:48 GMT

> If I want to generate a random number between a certain number, what might
> possibly be the formulae?
[quoted text clipped - 4 lines]
>
> Any help or link is appreciated. Thank you.

http://java.sun.com/j2se/1.5.0/docs/api/java/util/Random.html

int num = (new Random()).nextInt(35 - 10) + 10;

(note that it's probably better to store the Random object in a variable
somewhere for reuse... possible an instance variable, but that's a
design choice I leave to you)

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Peter MacMillan
e-mail/msn: peter@writeopen.com

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Peter MacMillan - 29 Apr 2005 06:57 GMT

> int num = (new Random()).nextInt(35 - 10) + 10;

just a note that nextInt excludes the upper-bound. So if you wanted to
include 35 as a possible result, you'd have to add 1 to it.

ie.
/* ... */.nextInt(max + 1 - min) + min;

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Peter MacMillan
e-mail/msn: peter@writeopen.com

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Generate a random number

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