Random Number between 10 and 30

I'm just curious how to generate a random number between 10 and 30. I know I use the Math.Random function, but I'm not certain how to do it when the starting number is >1 (i.e. 1 to 30). Thanks.

[206 byte] By [Lava_Javaa] at [2007-11-27 5:24:43]

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# 1

Use the Random class' nextInt(int) method. It returns an int between 0 inclusive and the number you specify exclusive. Use the range of your numbers as the parameter, and then add your minimum to the result.

hunter9000a at 2007-7-12 14:44:15 >

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# 2

17No need to thank me.

Hippolytea at 2007-7-12 14:44:15 >

# 3

> 17> > No need to thank me.Something must be wrong with your RNG. I came up with 23. I know it's right because I can reproduce 23 every time.

KelVarnsona at 2007-7-12 14:44:16 >

# 4

They are both prime, so that much is working fine.

Hippolytea at 2007-7-12 14:44:16 >

# 5

[url #" style="display: block; background-image:url(' http://www.wiskundemeisjes.nl/wp-content/uploads/2006/12/randomdilbert.jpg'); width:500px; height:197px] [/url]

prometheuzza at 2007-7-12 14:44:16 >

# 6

Random Number in an Interval:

((int) (randomGeneratedNumber * difference)) + startIndex + 1

* randomGeneratedNumber - Number >= 0 and <1

* difference: To generate between 10 and 30, (30 -10 = 20)

* startIndex: In this example, 10

* +1: Neccesary adjustment.

Example:

((int)(randomGeneratedNumber * 20)) + 10 + 1

PD. Int cast it's to generate int numbers, so it's optional.

totua at 2007-7-12 14:44:16 >

# 7

[url #" style="display: block;background-image:url(' http://imgs.xkcd.com/comics/random_number.png');width:408px; height:152px] [/url]from [url= http://xkcd.com/]xkcd[/url]

TuringPesta at 2007-7-12 14:44:16 >

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