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

[C#-Guy]

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

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

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!
        }
    }

[C#-Guy]

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

[Arjay]

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

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