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Thread: Random number generator
 03042012, 09:35 PM #1Senior Member
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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 02:59 PM.
 03052012, 02:08 AM #2Senior Member
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Re: Random number generator
any help please?
 03052012, 02:44 AM #3Member
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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, 02:55 AM #4Senior Member
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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, 03:42 AM #5Member
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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, 04:02 AM #6Senior Member
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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 03:00 PM.
 03052012, 02:59 PM #7Senior Member
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Re: Random number generator
anymore ideas?
 03052012, 03:13 PM #8Moderator
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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.
 03052012, 03:37 PM #9Senior Member
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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, 04:09 PM #10Moderator
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