Looping through an array of strings

Question

I have an array with letters for example

string[] arrayLetters = new string[] {"A","B", "C", "D"}

and so on.

Now a user will type in the number of sets he want to display...

if for example he types in 2, then the output would be:

AB,AC,AD, BC, BD

For a set of three, the output would be like:

ABC, ABD, ACD, BCD

... and so on.

Can you please help me solve this little scenario I have?

Thanks Mark Montebello the Cicco

In other words, you want to display all combinations of length N where N is entered by the user? This sounds a bit homeworkish, if that's the case, use the homework tag. — SWeko
– SWeko, Commented Apr 13, 2011 at 13:12
Yes, but the letter will be displayed once, and if the current location is B, the letter A won't be displayed — Cicco
– Cicco, Commented Apr 13, 2011 at 13:14
Please review: codeproject.com/KB/recipes/Combinatorics.aspx It will help you with your homework. — SQLMason
– SQLMason, Commented Apr 13, 2011 at 13:17

Panagiotis Kanavos · Accepted Answer · 2011-04-13 13:20:51Z

2

This Code Project article gives a good overview of combinations (what you are asking), permutations etc and provides a library for calculating them in C#. It's just one of the many libraries that provide this functionality.

BTW combinatorics is introductory computing material. That's why people suspect this may be a school assignment.

answered Apr 13, 2011 at 13:20

Panagiotis Kanavos

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3 Comments

Cicco Over a year ago

I see.. Thanks I will try it out... but it is not a school assignment.

Cicco Over a year ago

Can't the scenario I gave, be done by simple looping, not using any other classes..

cHao Over a year ago

Yes, it can. But most other examples will be using recursion, which confuses most people even more than classes do. :)

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