How do I split a word's letters into an Array in C#?

Question

How do I split a string into an array of characters in C#?

Example String word used is "robot".

The program should print out:

r
o
b
o
t

The orginal code snippet:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.IO;
using System.Text.RegularExpressions;


namespace Testing
{
class Program
{
    static void Main(string[] args)
    {
        String word = "robot";

        String[] token = word.Split(); // Something should be placed into the () to 
        //print letter by letter??

        foreach (String r in token)
        {
            Console.WriteLine(r);
        }
    }
}
}

How can the codes be correctly implemented?

Answer 1

Why not this?

public void WriteLetters(string s)
{
    foreach (char c in s)
    {
        Console.WriteLine(c); 
    }
}

If you really want to see it in an explicit character array, do the following:

string s = "robot";
char[] charArray = s.ToCharArray();

If you then want to print that out (1 per line), do the following:

for (int i = 0; i < charArray.Length; i++)
{
    Console.WriteLine(charArray[i]);
}

I'm not really sure what you're trying to do, so I may be way off base.

If by tokenize, you mean store the characters in an array, you already have that in a String object¹.

_{¹ Not actually true, because String uses an indexer to iterate through the character values, whereas in C/C++, a string is actually an array of characters. For our purposes, we can treat a string as if it is an array of characters}

Answer 2

The class String implements IEnumerable<char> and therefore to run through the letters of a string, you can just grab an IEnumerator<char> and process the chars one at a time. One way to do this is using a foreach:

foreach(char c in "robot") {
    Console.WriteLine(c);
}

If you need each char in an array you can just use String.ToCharArray:

char[] letters = "robot".ToCharArray();