c# - generate random number based on user input

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15 digits long would be to an int64 (Long in VB). Do you really need a numeric variable?...or will a String do as Andy suggests?

How big can these "numbers" get?...and how do you plan on using them?

ASKER

return value can be a string.

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>>Just make sure that the very first digit is not 0 (zero):

I would disagree unless by eg. 3 digit it means a random number >=100 and <= 999.

True...just depends on how the number will be used.

Based on it being user input - in other words it could be 50 digit then it must be a string so for me 000000...000 is just as random as 100000....000

Anyway, wait and see.

ps. If the first digit MUST be 1...9 then one doesn't need R.Next(i == 1 ? 1 : 0, 10).ToString()
Just force the first digit to be in that range then loop from 2 up to the max digit count.

ASKER

first digit must be between 1 and 9

If this is an academic excercise I would like to see what happens if the prof asks people for a 50 digit random number based on their code (I guess a few would only consider pure numeric possibilities and so have limited the range of values their code would work with).
What is the smiley for an evil grin ?

"What is the smiley for an evil grin ?"

Hmmm...

I like this one the best:

}:-)

Nice one.

No love for Andy?... :-(

@Idle_Mind
Thanks for the support.
I like to give hints and advice as to help one to help oneself (Better to learn to write code than just how to copy/paste) but it does have a negative effect at times. I'm used to it by now (shit happens) - and I don't mind if it was a nice piece of code that was accepted.

ASKER

Sorry Andy. I tried to go back and give you points but couldn't after I already submitted. I should have been more mindful when selecting a solution.

Up to you. As I indicated earlier I can live with the current situation (and no grudges being held).

If you want to change things there is a link near the body of the question - request attention.

ASKER

Submitted a request for attention.

Yay! =)