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Numbers and strings

Posted on 2011-03-16
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Last Modified: 2012-05-11
I have a number like 2635 that will be drawn from a db.  I need to create a random 4 digit number and have it put before the number.  I then need to put a different 4 digit number at the end.  So they would all be strung together like 374226358374.  

Then, I would need to break this number apart and isolate the original number.

Thanks
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Question by:Rush_2112
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sajayc earned 500 total points
ID: 35152953
Hi,

This will just involve a couple of variables.

<cfset originalnum = query.number> <!--- This is the value from database  --->
<cfset randbefore = randrange(1000,9999)>
<cfset randafter = randrange(1000,9999)>
<cfset entirenumber = randbefore & originalnum & randafter>
<cfoutput>#entirenumber#</cfoutput>

The variables above will have everything seperate.

If you need to pull your orginal number out of the entire string, this code will do it.
<cfset extractnum = mid(entirenumber, 5, 4)> <!--- entirenum is the variable of the full number  --->
<cfoutput>#extractnum#</cfoutput>

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Expert Comment

by:_agx_
ID: 35153411
(no points)

The technique above will probably be fine for your purposes.  But note RandRange generates pseudo random numbers. So if you have other requirements, like unique numbers, etc... that's something to keep in mind.

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Expert Comment

by:Brijesh Chauhan
ID: 35153720
Another thing is that will your number be always of 4 digits like you have mentioned '2635' or the digits can change, this is because you need to get the number back,


if your number digit change, then you would need to store the number of digits in your orginal number somewhere and use the count in the code posted by @sajayc
<cfset originalNumber = '23456' />
<cfset count = len(originalNumber) />
<!--- ADD RANDOM NUMBERS --->
// code from @sajayc
<!-- EXTRACT , just add the count in there instead of 4 --->
<cfset extractnum = mid(entirenumber, 5, count)> <!--- entirenum is the variable of the full number  --->
<cfoutput>#extractnum#</cfoutput>

Also, as pointed by @_agx_ above, uniquness and randomness are 2 different things, unique is putting a restriction on random generation to have something not already generated.

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Author Closing Comment

by:Rush_2112
ID: 35159426
Worked perfectly!  Thanks!  And thank you to everyone else who commented
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