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 09-13-2012, 06:19 PM PM User | #1 NDF New to the CF scene   Join Date: Oct 2011 Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts Generate a random number? I'm trying to generate a random number in Java. I need one number to be between 5.00-20.00 (going by intervals of 5.01, 5.02, 5.03, etc) I also need the same thing between 1.00-5.00. How would I go about doing this?
 09-13-2012, 09:30 PM PM User | #2 Fou-Lu God Emperor     Join Date: Sep 2002 Location: Saskatoon, Saskatchewan Posts: 16,603 Thanks: 4 Thanked 2,598 Times in 2,567 Posts I don't believe there is an existing built in class to find random between two specific numbers. One can be easily written though, by basing off of the min and max provided. PHP Code: ``` public static double randBetween(double dMin, double dMax){    // either extend Random and call to this, or make random.  I'll make random here    Random r = new Random();    return dMin + (r.nextDouble() * (dMax - dMin));}  ``` Done and done. To format to two decimal places, you may use the printf: PHP Code: ``` System.out.printf("%.2f\n", randBetween(5.0, 20));  ``` Or mathematically calculate it by cast, multiply and divide: PHP Code: ``` double d = randBetween(5, 20);d = ((double)(int)(d * 100)) / 100;  ```

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