double random number and array

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3.00/5 (2 votes)

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this is the code random gen in integer, right?

C#

Random random = new Random();
int irandom = random.Next(1, 100);

what about for random gen in double?
from 0.0 to 100.0

and how make an array (25 to 50) random numbers?

Posted 24-Oct-11 17:40pm

Jonathan C101

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Sergey Alexandrovich Kryukov 25-Oct-11 1:19am

How about reading (very short) MSDN help page in Random, too hard, asking a question is easier?
--SA

3 solutions

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Prerak Patel · Answer 1 · 2011-10-24T17:49:00

Solution 1

You can use NextDouble or Sample and add it to your random integer.
Ref: http://msdn.microsoft.com/en-us/library/system.random.nextdouble.aspx[^]

You can generate n number of randoms and put it in array or whatever. Try it.

Posted 24-Oct-11 17:49pm

Prerak Patel

Updated 24-Oct-11 17:50pm

v2

Comments

Sergey Alexandrovich Kryukov 25-Oct-11 1:20am

Sure, a 5.
--SA

Prerak Patel 25-Oct-11 3:01am

Thanks.

CPallini 25-Oct-11 4:08am

I believe the proper way to do it is scaling and offsetting the random double to match the requested range. However, I guess it doesn't matter for a uniform distribution (like the one of the PC pseudo-random generator).

Anuja Pawar Indore · Answer 2 · 2011-10-24T21:59:00

Solution 2

Refer this thread
http://stackoverflow.com/questions/609501/generating-a-random-decimal-in-c-sharp[^]

Posted 24-Oct-11 21:59pm

Anuja Pawar Indore

Amir Mahfoozi · Answer 3 · 2011-10-24T22:28:00

Solution 3

get a random number between 0 and 1000 and then map it to 0 to 100 to get a random number between 1 and 100 with one decimal point precision.

C#

public static double getrand()
{
    Random random = new Random();

    return random.Next(0, 1000)/10.0;
}

Posted 24-Oct-11 22:28pm

Amir Mahfoozi

Updated 25-Oct-11 0:10am

v2

Comments

André Kraak 25-Oct-11 4:48am

My reason for 1 vote:
As mentioned in solution 1 the Random Class[^] has the method NextDouble[^].

Amir Mahfoozi 25-Oct-11 6:14am

I didn't know that we should always respect to solution 1 here!
Thank you for reminding me.