Results 1 to 10 of 10
Thread: Random number generator
 03042012, 10:35 PM #1Senior Member
 Join Date
 Mar 2011
 Posts
 171
 Rep Power
 0
Random number generator
lets say i have a number 496574... I want add up all of those numbers, so 4+9+6+5+7+4 = 30. Next I want to check if it is divisible by 3. If it is, then done. Otherwise I want to arrange the numbers in order from greatest to least and take out the smallest possible number so that it is divisible by 3.
For instance 468793 = 37... So now I want to sort that from greatest to least > 987643 and then I want to remove 1 or more numbers so that it is the greatest number possible and divisible by 3. In this case we would remove the 4 to get 98763 = 33 which is divisible by 3. That is the ONLY correct answer. taking out the 7 would work too, however, I want the greatest number that we can produce with those digits, and 98643 would be wrong seeing as 98763 is greater. That is what I want to accomplish with this.
So, I created a random number generator to produce a 6 digit number, but I feel like I am doing it wrong for what I want to use it for.
I want to create a 6 digit number where I can add up all of the digits to produce some number and see whether or not that is divisible by 3.
The way I did this was...Java Code:int[] x = new int[6]; public void randomNumber() { Random generator = new Random(); for(int i = 0; i<6; i++) { int randomInt = generator.nextInt(10); System.out.print(x[i] = randomInt); }
Last edited by adjit; 03052012 at 03:59 PM.
 03052012, 03:08 AM #2Senior Member
 Join Date
 Mar 2011
 Posts
 171
 Rep Power
 0
Re: Random number generator
any help please?
 03052012, 03:44 AM #3Member
 Join Date
 Sep 2010
 Posts
 84
 Rep Power
 0
Re: Random number generator
Java Code:public class test42 { public static void main(String[] args) { String number = ""; int temp; Random x = new Random(); for (int i = 0; i < 6; i++) { String anumber = Integer.toString(x.nextInt(10)); number = number + anumber; } temp = Integer.parseInt(number); // now you have a 6 digit int } }
 03052012, 03:55 AM #4Senior Member
 Join Date
 Mar 2011
 Posts
 171
 Rep Power
 0
Re: Random number generator
so now how would I go about adding up all of the digits in that number? and then sorting the number from greatest to least?
 03052012, 04:42 AM #5Member
 Join Date
 Jan 2012
 Location
 The Coffee Pot
 Posts
 36
 Rep Power
 0
Re: Random number generator
You might be able to add all of those digits together in a string, then parse it after the loop? If I'm understanding what you want to do correctly...
 03052012, 05:02 AM #6Senior Member
 Join Date
 Mar 2011
 Posts
 171
 Rep Power
 0
Re: Random number generator
lets say i have a number 496574... I want add up all of those numbers, so 4+9+6+5+7+4 = 30. Next I want to check if it is divisible by 3. If it is, then done. Otherwise I want to arrange the numbers in order from greatest to least and take out the smallest possible number so that it is divisible by 3.
For instance 468793 = 37... So now I want to sort that from greatest to least > 987643 and then I want to remove 1 or more numbers so that it is the greatest number possible and divisible by 3. In this case we would remove the 4 to get 98763 = 33 which is divisible by 3. That is the ONLY correct answer. taking out the 7 would work too, however, I want the greatest number that we can produce with those digits, and 98643 would be wrong seeing as 98763 is greater. That is what I want to accomplish with this.Last edited by adjit; 03052012 at 04:00 PM.
 03052012, 03:59 PM #7Senior Member
 Join Date
 Mar 2011
 Posts
 171
 Rep Power
 0
Re: Random number generator
anymore ideas?
 03052012, 04:13 PM #8Moderator
 Join Date
 Apr 2009
 Posts
 13,319
 Rep Power
 23
Re: Random number generator
You've got your number now, so how do you think you should go about it?
Bestsanchez has given an idea of a possible solution involving Strings.
You might choose to store the 6 digits in a different way than in a String.
However you choose to go you need 6 digits that you can manipulate.
I'd suggest figuring out how you would do this by hand and then translate that into code.Please do not ask for code as refusal often offends.
** This space for rent **
 03052012, 04:37 PM #9Senior Member
 Join Date
 Mar 2011
 Posts
 171
 Rep Power
 0
Re: Random number generator
So, what I did is create a array of length 6 and put 6 random numbers in there. Next I checked to see if a[I] +.... Etc add up to a number that is divisible by 3. If it was then stop, otherwise I sorted the array using arrays.sort. that gives the number to me sorted from least to greatest, not what I need, so i assigned each number to variables af assigning them from greatest to least. Next what I was thinking about making an if statement asking if the remainder is 1 (of a+...+f) search the numbers for 1,4,and 7.
Or what about a while(true) then have the if statements in that and switch to false if you find that number
 03052012, 05:09 PM #10Moderator
 Join Date
 Apr 2009
 Posts
 13,319
 Rep Power
 23
Similar Threads

Random Phone number generator
By elecleoalune in forum New To JavaReplies: 15Last Post: 05192014, 12:37 PM 
Random number generator with range.
By hifriend in forum New To JavaReplies: 2Last Post: 11152011, 09:12 PM 
Help with Random Number Generator
By celtics in forum New To JavaReplies: 0Last Post: 03072011, 09:18 PM 
Random number generator
By zerwik in forum New To JavaReplies: 3Last Post: 12262010, 01:10 PM 
Random number generator
By Michailangelo in forum Advanced JavaReplies: 4Last Post: 04022010, 06:47 PM
Bookmarks