Question

The program should take in a parameter N and print out N + 1 lines.
I have to output something like this.

This is the output which I must get at N = 5

A //Increment by 0

AB //Increment by 1

ACE //Increment by 2

ADGJ //Increment by 3

AEIMQ //Increment by 4

The algorithm uses N as the number of characters to skip in between each add. So at N=3, it’s A skip 3 to D, skip 3 to G, skip three to J.

And when the program runs out of upper case characters(i.e. When N is too big), it should start with lower case characters and if it runs out of lower case then it should again start with upper case and so on.
I am a novice to programming. And I dont really know where to start. I’ve been working around the loops for a while and still have no clue what-so-ever.

Answer 1

Here’s another approach using a Char[], modulo, StringBuilder and a for-loop which increments by n for efficiency:

readonly static Char[] letters = 
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".ToCharArray();

static String appendChars(int n)
{
    int length = n + 1;
    StringBuilder sBuilder = new StringBuilder("A", length);

    for (int i = n; sBuilder.Length < length; i += n)
    {
        Char nextChar = letters[i % letters.Length];
        sBuilder.Append(nextChar);
    }

    return sBuilder.ToString();
}

test your sample data:

int n = 5;
IEnumerable<String> allWords = Enumerable.Range(0, n).Select(i => appendChars(i));
Console.Write(string.Join(Environment.NewLine, allWords));

outputs:

A
AB 
ACE 
ADGJ 
AEIMQ

Here’s the demo: http://ideone.com/0sspY