Question

How to create 2 letters permutation from A, B, C, and D in C#

Answer 1

using System;

// In a combination, the subset elements can be listed in any order.

public class TwoLettersCombinationFromABCD_CSharp
{
	private static void create_2_letters_combination(char[] letters) {
		int size = letters.Length;

		for (int i = 0; i < size; i++) {
			for (int j = i + 1; j < size; j++) {
				Console.WriteLine("{0}{1}", letters[i], letters[j]);
			}
		}
	}
	public static void Main(string[] args)
	{
		char[] letters = new char[] {'A', 'B', 'C', 'D'};

		create_2_letters_combination(letters);
	}
}



/*
run:
 
AB
AC
AD
BC
BD
CD
  
*/

 

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