using System;

class T1
{

        public static void Main()
        {

                Console.WriteLine("Ask me a question:");
                string sentence = Console.ReadLine();
                string[] sentenceArray = sentence.Split(" ".ToCharArray());
                int arrayLength = sentenceArray.Length;

        }

As you can see I've taken string input from the console and parsed each
word into a string[].  How do I go about capturing the last element of
my array?  For example, if the user inputs "What kind of question?", I
need to find out what the punctuation is that ends the sentence(the last
element) and return that character to a variable.

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Your code splits the string on a space, so the punctuation will most likely
be with the last word. Given your original example ("What kind of
question?"), and given your code:

I'm assuming that sentenceArray[] will contain the following:

    sentenceArray[0] = "What"
    sentenceArray[1] =  "kind"
    sentenceArray[2] = "of"
    sentenceArray[3] = "question?"

You'll have to check the last character in the last array element to find
out about punctuation.
--
Jeff Ferguson
http://staff.magenic.com/jefff/

string sentence = "do you have a question?";
string[] sentenceArray = sentence.Split(" ".ToCharArray());
int l = sentenceArray.Length;
string punct = sentenceArray[l-1].Substring(sentenceArray
[l-1].Length-1, 1);

this will blindly assume that the last character in the
last word is the punctuation.

(" ".ToCharArray());