how to generate 10 million unique numbers using alpha numerics?

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how to generate 10 million unique numbers using alpha numerics?
hai need a method to generate 10 million unique numbers using .net

Thanks advance.

Posted 16-Sep-14 23:00pm

sateesh kumar nemalikanti

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CPallini 17-Sep-14 5:05am

Could you please elaborate?

sateesh kumar nemalikanti 17-Sep-14 5:10am

thanks Cpallini ,ineed to generate random numbers.upto 10 million in those duplicates must not be repeat. and generated number length must be static for all 10 millions.

Richard MacCutchan 17-Sep-14 5:23am

How about using 1 to 10,000000 and convert to a fixed length string.

sateesh kumar nemalikanti 17-Sep-14 5:33am

hai go through below article ,and in this article only 1 million unique numbers are generated but i need 10 millions .http://www.codeproject.com/Articles/14403/Generating-Unique-Keys-in-Net

Richard MacCutchan 17-Sep-14 5:51am

If the article does not do exactly what you need then either modify the code or ask the author for help.

Nelek 17-Sep-14 5:37am

virtual 5 from me

Richard MacCutchan 17-Sep-14 5:52am

Who would think this such a difficult issue. :(

sateesh kumar nemalikanti 17-Sep-14 6:35am

then send me code dude.........

Richard MacCutchan 17-Sep-14 6:37am

If you cannot be bothered even to try something for yourself, then do not be surprised if other people take the same approach. Please read http://www.codeproject.com/KB/FAQs/QuickAnswersFAQ.aspx.

sateesh kumar nemalikanti 17-Sep-14 5:36am

i.e i need some fixed length eg: 10 characters unique number generator using alpha numerics

Nelek 17-Sep-14 5:39am

What is wrong with the suggestion of Richard MacCutchan?
1 ---> 0000000001
10,000,000 ---> 0010000000

Tataaaa 10 million unique numbers with fixed length

sateesh kumar nemalikanti 17-Sep-14 6:34am

yes
help me

Nelek 17-Sep-14 6:52am

We already helped you. We gave you the idea you can use. This is a quite easy task. To write the code is your job. People here help for free. If you can not write the code and want a working solution, then hire someone.

[no name] 17-Sep-14 7:04am

:)

3 solutions

Solution 1

Use GUID to generate unique alpha numeric value.

32 chars.

OR

Choose 3 char and 4 numbers and go with serial numeric value and increase value of number.
For loop for first char {
For loop for second char {
For loop for second char {
For loop for Numbers {
}
}
}
}

All you need to do is just save data to permanent storage like database after a chunk of number generated like 1000 records.

Posted 16-Sep-14 23:11pm

Chetan Patel

Comments

sateesh kumar nemalikanti 17-Sep-14 5:19am

i need 10 million records sandeep. and repetation must not be allowed and generated number length must be static for all 10 millions.

Solution 3

C#

string[] TenMillionsId = new string[10000000];

for (int i = 0; i < 10000000; i++)
{
    Guid h = Guid.NewGuid();
    TenMillionsId[i] = h.ToString();
}

Posted 17-Sep-14 1:34am

mhegazy94

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CPallini · Accepted Answer · 2014-09-17T00:03:00

Solution 2

This outputs '00000' as first number and '5yc1r' as 10000000^th number

C#

static void Main(string[] args)
{
  const int BASE=36;
  char[] base36 = {'0','1','2','3','4','5','6','7','8','9','a','b',
                   'c','d', 'e','f','g','h','i','j','k','l','m','n',
                   'o','p','q','r','s','t','u','v','w','x','y','z'};

  int[] idx = { 0, 0, 0, 0, 0  };
  for (int n = 0; n < 10000000; ++n)
  {
    string s = string.Empty + base36[idx[4]]+ base36[idx[3]] + base36[idx[2]] + base36[idx[1]] + base36[idx[0]];
    Console.WriteLine(s);
    ++idx[0];
    if (idx[0] == BASE)
    {
      idx[0] = 0;
      ++idx[1];
      if (idx[1] == BASE)
      {
        idx[1] = 0;
        ++idx[2];
        if (idx[2] == BASE)
        {
          idx[2] = 0;
          ++idx[3];
          if (idx[3] == BASE)
          {
            idx[3] = 0;
            ++idx[4];
          }
        }
      }
    }
  }
}

Posted 17-Sep-14 0:03am

CPallini

Updated 17-Sep-14 0:05am

v3

Comments

sateesh kumar nemalikanti 17-Sep-14 6:30am

hai cpallini, thanks for your help,

But i need to use that number as a unique id.
i need a method that will produce unique id every time i call that method.id should be unique for upto 100,00,000 ids.

sorry for inconvenience this is my exact requirement.
upto 60, 00,000 also acceptable please help me any one thanks

CPallini 17-Sep-14 7:26am

Does your id need to be random, in the sequence?

sateesh kumar nemalikanti 17-Sep-14 9:37am

yes it is random or sequence, but whenever i call it will give a unique id and id should not match with the previously generated ids.

CPallini 17-Sep-14 9:46am

My code gives you 10000000 different alphanumeric codes corresponding to numbers in the 0..9999999 range.
You might:
1. Modify it in order to give you the alphanumeric code corresponding to a given number (in the 0..9999999 range).
2. Randomly extract, without repetition, a number in the 0..9999999 range and use the extracted number to retrieve the corresponding alphanumeric sequence.

Point 2 is tricky, because you have to somehow record all the previous extracted numbers.
In my tip:
http://www.codeproject.com/Tips/54678/Random-extraction-of-cards-from-a-deck
You may find the algorithm used for random extraction without repetitions.

sateesh kumar nemalikanti 17-Sep-14 9:51am

i need one id at a time but it gives 10000000 at a time.

CPallini 17-Sep-14 10:15am

Well, instead of making n running form 0 to 9999999, you can randomly choose n. That is, just remove the for loop and wrap it with a function...

sateesh kumar nemalikanti 18-Sep-14 1:33am

Thanks a lot Cpallini.

CPallini 18-Sep-14 1:40am

You are welcome.