[Tutorial] Switch..Case, Loops and 1D Arrays *Heavily Commented*

I've been learning C# for a while now and I just though this might be helpful to someone that wants to learn about these specific areas of C# although very simple stuff can be hard to understand to someone learning.

This also demonstrates a int to string work around

I can do more upon request but if not, I hope this helps someone :).

WITHOUT COMMENTS

Code:

---

class Program
    {
        static void Main(string[] args)
        {
            int[] ints = new int[5] {1, 4 , 11, 19, 22};

            string input;
            int inputText;

            input = Console.ReadLine();

            inputText = int.Parse(input);

            switch (inputText)
            {
                case 1:
                    {
                        for (int i = 0; i < ints.Length; i++)
                        {
                            Console.WriteLine("for Loop ints array {1}: {0}",ints[i] , i);
                        }
                        break;
                    }
                case 2:
                    {
                        foreach (int i in ints)
                        {
                            Console.WriteLine("foreach Loop ints array: {0}", i);
                        }
                        break;
                    }
                case 3:
                    {
                        int i = 0;
                        do
                        {
                            Console.WriteLine("do...while Loop ints array: {0}", ints[i]);
                            i++;
                        } while (i < 5);
                        break;
                    }

                case 4:
                    {
                        int i = 0;
                        while (i < 5)
                        {
                            Console.WriteLine("while Loop ints array: {0}", ints[i]);
                            i++;
                        }
                        break;
                    }
            }
            Console.ReadLine();
        }
    }

---

WITH COMMENTS

Code:

---

class Program
    {
        static void Main(string[] args)
        {
            int[] ints = new int[5] {1, 4 , 11, 19, 22}; // int array with 5 elements, each element is pre defined.

            string input; //input is the string we type into the console before pressing "enter"
            int inputText; // inputText is an int value that we will put the string representation of an int inside this after we parse it

            input = Console.ReadLine(); // input now equals whatever we put into the console

            inputText = int.Parse(input); // inputText (int) now equals the parsed string (input) as an int32 value

            switch (inputText) // switch can called by anything such as string, boolean, char ect.. in this case, it's an int value (inputText
            {
                case 1: // case 1 is int value of 1, so in the console we type "1" to call this case
                    {
                        for (int i = 0; i < ints.Length; i++) // define i as an int; if i is less-than ints array length; increment i by 1 every pass
                        {
                            Console.WriteLine("for Loop ints array {1}: {0}",ints[i] , i); // write to console every pass with ints array i value followed by i value
                        }
                        break; // break out of the switch..case and run the rest of the code, you can use goto statement here too
                    }
                case 2: // case can also be a string or char or boolean so it could be "case "foreach": but the switch input needs to be set to string
                    {
                        foreach (int i in ints) // for each integar in ints array, there are 5 elements in the array with 5 integars of [1], [4], [11], [19], [22]
                        {
                            Console.WriteLine("foreach Loop ints array: {0}", i); // print the value of i each pass, first pass will be 1, second 4.. ect..
                        }
                        break; // again, break out of switch..case.
                    }
                case 3:
                    {
                        int i = 0; // define i equals 0
                        do // do the bottom statement
                        {
                            Console.WriteLine("do...while Loop ints array: {0}", ints[i]); // print the value of ints array using the value of i to find the array element
                            i++; // increment (add) by 1
                        } while (i < 5); // do the statement WHILE i is less than 5 (5 elements in the array)
                        break; // :)
                    }

                case 4:
                    {
                        int i = 0; // i equals 0 again, each i in each case is destroyed after each use and only created while in use so you can use int i all you like
                        while (i < 5) // while i is less than 5 do the bottom statement.
                        {
                            Console.WriteLine("while Loop ints array: {0}", ints[i]); // same as do..while (case 3)
                            i++; // increment i by 1 each pass
                        }
                        break;
                    }
            }
            Console.ReadLine(); // finally readline() just so we can see the result of the case we chose so console don't close instantly!
        }
    }

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I forgot to mention I'm using Visual Studio 2012 with .NET 4.5.

Thanks, but the forums aren't the place to post tutorials.

Please submit this as an article to the main codeguru site.