Generate a 4 digit number

Question

2.14/5 (4 votes)

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How go I generate a 4 digit number starting from 0000 to 4999.
This is what I've tried so far

C#

Random rnd = new Random();
rnd.Next(0000, 4999);
int id = rnd;

I can use (1, 9) four times but isn't there another way?

Posted 9-Aug-13 9:16am

Member 7434378

Updated 9-Aug-13 9:19am

André Kraak

v2

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Comments

Sergey Alexandrovich Kryukov 9-Aug-13 15:22pm

The question makes no sense at all.
If you really need to have them from 0 to 4999, do this. Do you really understand that 0, 00, 000, and 0000 is the same number?
Your second options really means "all numbers between 0 and 4999 having no zeros in decimal representation of numbers".
I don't think that you really mean it. I'm almost sire you don't need such a set. If you do, you don't need another way.
Anyway, if you have such a weird requirement, explain why.
You have one fundamental problem: cannot formally specify requirements. How we can seriously talk about any programming then?
—SA

Member 7434378 9-Aug-13 15:32pm

I don't want to start from 1000 I want to start from 0, e.g if I want the number 3 it must be like 0003.

Manfred Rudolf Bihy 9-Aug-13 16:12pm

A number is a number, but what you're talking about has to do how to format the number when ouput. Please see here: http://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.80).aspx

So to solve your question all you have to do is generate a number between 0 and 4999 and then Format it with D4 as the format specification. This will pad the output with zeros up to a length of 4 characters.

Cheers!

Matt T Heffron 12-Aug-13 15:21pm

+5

2 solutions

Solution 1

Try this:

Random rnd = new Random();
int myRandomNo = rnd.Next(1000, 9999);

Posted 9-Aug-13 9:18am

Manas Bhardwaj

Comments

Manfred Rudolf Bihy 9-Aug-13 16:44pm

OP has a formatting problem and not a problem with generating the numbers themself. In my comment to OP's question I advised him to use String.Format("{0:D4}", number) to solve this issue.

Manas Bhardwaj 9-Aug-13 16:49pm

Hi Manfred,

If I see OPs code i.e.

rnd.Next(0000, 4999);

This would not always generate a 4 digit number as the seed starts from 0. Potentially it can generate numbers from 0 - 999.

Adding to that, I am not sure why OP stops at 4999 when he can go on to 9999.

Manas Bhardwaj 9-Aug-13 16:50pm

Ah, I see the discussion thread now. It was not at least clear to me from the original question. :)

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Member 7434378 · Accepted Answer · 2013-08-09T09:49:00

Solution 2

C#

Random rnd = new Random();
int id = rnd.Next(0, 4) + rnd.Next(0, 9) + rnd.Next(0,9) + rnd.Next(0, 9);

Posted 9-Aug-13 9:49am

Member 7434378

Updated 9-Aug-13 9:56am

v3

Comments

ridoy 9-Aug-13 15:57pm

this is not a definitely not random number.

Manfred Rudolf Bihy 9-Aug-13 16:01pm

Sorry, but that is not a solution to your question. I hope you're not trying to abuse CP here. You are just adding these numbers up.

Manas Bhardwaj 9-Aug-13 16:36pm

This would maximum be 2 digit number (25).

Manas Bhardwaj 9-Aug-13 16:36pm

Btw, look at my answer.